The whole of the drill bit, shaft and shank, is usually of the same diameter. Throughout most of industrial history, the greater part of crushing and mining part of the process occurred under muscle power as the application of force concentrated in the tip of the miners pick or sledge hammer driven drill bit. Set the depth. Why We Liked It: This quality 6.5 amp 3/8 inch corded drill from Porter-Cable is ideal for both the professional and the home handyperson. Our blog section, Cordless tools Youll save lots of time by reading our reviews and selecting the best corded drill from our list. The hammer of the drill acts to accelerate only the drill bit itself, and not the large mass of the chuck, which makes hammer drilling with an SDS shank drill bit more productive. A masonry bit is whats truly essential. I generally recommend getting a pro-level tool for even DIY work. This is why a corded drill is generally more powerful than a cordless drill. You can also get a portable nibbler with-out a lead, the best cordless nibbler is made by Makita it would give you the movement and flexibility to move without a compressor hose or power lead getting in your way when walking back and forwards on a roof fix or build. It has enough power to drill through concrete and masonry. It has plenty of power and allows for extended drilling time. In general a masonry bit will be enough for most residential projects like hanging pictures. When to use a miter saw instead of a circular saw? Without a good bit, no matter what type of drill you use, you wont get through concrete. Make sure the drill has a charged battery in it. It also has a D handle to give you better control when using this power tool. A range of sleeves may be used to bring the size of the smaller Morse tapers up to the size of the drive spindle's larger taper. Aviation snips are the cheapest option by far. I like to buy bits with a diamond coating. Some drills, wire wheels, etc. Slow down and pause occasionally to prevent overheating. Threaded drill bits may be held in drills meant to reach into very tight spaces, and threaded countersink cutters are widely used (along with finely adjustable depth stops) to create holes which put a matching rivet directly flush with the surface. Make sure the tip of the drill bit is touching the material before you start drilling, and that the drill bit is held at a reasonable angle. Most commercially-available models can cut metal at the thickness of up to 18 gauge. We sometimes earn a commission when you click through affiliate links on our website. In industry, crushers are machines which use a metal surface to break or compress materials into small fractional chunks or denser masses. Watch full episodes, specials and documentaries with National Geographic TV channel online. Approved. These drills are commonly used to secure long bolts or screws into wood, metal, and concrete, as well as loosening ceased or over torqued bolts. Nibblers are the tool choice for professional roofers for these reasons. The smaller indentations that do not open to the end are grasped by the chuck to prevent the drill bit falling out. Carry a masonry nail with you. If you know the size of the bolt, you can use this chart. The triangle shank is almost always made by machining three flats on round bar stock. This 6.5 amp 3/8 inch Porter-Cable electric drill is the perfect corded drill for use both on the job site and in the home workshop. Although they dont eject shards in the same way as conventional nibblers, they still have shields for protection against the bits of metal that break off from the workpiece. "This article was impressive! In most cases, when going straight through the material, this means that the drill bit will be perpendicular to the material. Its one of the most versatile tools in your toolkit. If you have any questions or comments e-mail us any time. torque: 80Nm; Impact rate: If youre constantly drilling into hard materials such as steel or masonry, youll want a corded drill with an 8 to 10 amp motor. Some reviews have stated that the drill is a little heavy for one-handed operation. Battery-powered models are a good choice if portability is a top priority, but corded electric models provide more cutting power and speed. The Irwin 29-piece Cobalt M-42 Metal Index Drill Bit Set performs very similarly to the M42 set. The lock-on button and additional handle give you better control and reduce fatigue when you're drilling a lot of holes. Thats why weve done some research on the 10 best corded drills available today. SDS-Top with 14 mm diameter has been largely phased out in North America and is not common except for older tools. While cordless drills have to rely on the amperage of the battery they use, corded drills plug straight into a power socket. Corded nibblers will never run out of power obviously, but you do need to run out multiple leads to get on a roof. If this is hard to visualize, run the drill slowly and pay attention to the direction the flutes of the bit are moving in, and what direction they need to be moving in to cut material. ", "Well-written, and gave me the missing detail for my problem situation (step 7).". These are made much better than a traditional masonry bit and can last for years. Most nibblers can also be used to cut aluminum, copper, corrugated iron, PVC, and zinc. Even though the bits are designed to withstand it, its still a good idea to let them cool a bit before going from hole to hole. The dose of our gummies can vary from 1 to 3 pieces per serving, so make sure you check the packaging some of our gummies kick harder than you might expect. OK, youve got the drill ready and your bits picked out along with some additional supplies and safety equipment, now what. Call us at (800) 350-8665 for support. Thank you for putting this article out for all of us DIYers! The Makita JN1601 16 Gauge 5 Amp nibbler is a better-sized tool for general use and is easier to handle while being a bit cheaper than the 10 gauge version. In German-speaking countries the back-formation Spannen durch System ("Clamping System") is used, though Bosch uses "Special Direct System" for international purposes.[1][2]. wikiHow marks an article as reader-approved once it receives enough positive feedback. demolition of concrete walls or floors). This Dewalt corded drill is ideal for drilling into both steel and wood. There a lot of heat and pressure inside that hole as you drill. It is held usually in a three-jaw drill chuck. If you hit a stone, back out the drill bit and bang in the nail. It's powerful enough for most jobs but also lightweight enough to eliminate fatigue while working. Powerful 10 amp Dewalt motor with overload protection, Includes an additional handle with a 360-degree locking mechanism. To drill into concrete, use a hammer drill with a carbide-tipped masonry bit. S&D bits are 6 inches (150mm) long with a 3-inch (76mm) flute length. Professionals use a diamond core rig to drill holes with a larger diameter than rotary hammers can achieve. Drilling a hole in concrete is a useful and handy technique. Batteries for all tools, from drilling to cutting. What metals and thickness can nibblers cut? Drill bits that can drill through concrete are called masonry bits. DWA1269. Applying correct positioning and pressure. Call us at (800) 350-8665 for support. The term is commonly used to refer to tracker format music which intentionally sounds similar to older PSG-created music (this is the original The shank is the end of a drill bit grasped by the chuck of a drill.The cutting edges of the drill bit contact the workpiece, and are connected via the shaft with the shank, which fits into the chuck. Add an additional " (6 mm) to the embedment to allow room for the dust that accumulates during drilling. Electric metal shears can sometimes be cheaper than nibblers and can be powered by just your Makita or Dewalt 18v drill. The amount of power the drill has is important when you consider what youre going to use it for. Need help? How to cut a circle in wood, plastic, and metal? INTOO Mini Drill Bit Set 60 Pcs+12 Pcs Free High Speed Steel HSS Titanium Micro Drill Bits 3/64"-1/8" Metal,Plastic,Wood Drill Wood, Plastic, etc. Masonry bits cut holes through concrete in two Gerber specializes in providing brick and stone laying services, concrete installations, and masonry repairs. If you weren't aware, Metabo HPT is the rebranded name for the previous Hitachi line of tools. Because concrete is a hard, dense material, screws embedded 1 inch (2.5 cm) deep are sufficient for hanging light-weight objects. But if you have concrete with more cement and less aggregate, itll be easier to drill through. Have a look around, and dont hesitate to ask me any questions, you can find out more about me here. You may not have heard of nibblers before, even if youve done a fair bit of roofing work but they make the cut. Have a spare or two on hand. The Irwin 29-piece Cobalt M-42 Metal Index Drill Bit Set performs very similarly to the M42 set. But for small cutting jobs and occasional DIY cutting, you can get the job done with similar results with an appropriate drill attachmentor even tin snips with-out having to purchase a nibbler. This tool also features a belt clip for securing the power tool and a 6-foot long power cord. Cordless battery-powered nibblers always have the edge over corded models in terms of portability. The addition of the hammer significantly increases the torque of the drill. Plus, it has an 8-foot long cord and an all-metal keyed chuck. Pull the trigger and start drilling slowly. It's perfect for all those DIY jobs around the home and is especially good for drilling into wood. Even though concrete is a very dense material, you can still drill into it. Whether you choose a drill with a keyless or keyed chuck is entirely your own preference. The head is flatter because its designed to chip and pulverize the concrete as it drills into it. I increase the drill bit diameter as I go. Support wikiHow by A masonry bit is whats truly essential. The shank is the end of a drill bit grasped by the chuck of a drill. So, the larger the size of the chuck, the more powerful the drilling because the drill can accommodate a more sturdy drill bit. The concrete mix is another factor. Occasionally stop the drill and pull it out to let it cool for a few seconds. Landscaping The of-cuts are usually pretty sharp, so most nibblers have plastic shields that protect you and your eyes from the flying debris. High Performance: 400 in-lbs torque, 2 variable speed setting(0-400rpm&0-1,600rpm), 20+1 torque settings. This requires a very strong bit with a reinforced head, often times coated with diamond dust. Meaning, less concrete in contact with metal, and a longer-lasting drill bit. We may earn commission from our brand partners when purchasing products through our links. This drill is quite heavy at 6 pounds, but the additional handle gives you better control. However, if youre going to be mainly drilling into wood, then a hammer drill is unnecessary. Standard lengths are 12 to 21 inches (300 to 530mm). For tips on getting all the dust out when you're finished drilling, scroll down! Then you need to consider both Nibblers, electric shears, and tin snips. Or maybe you have a patio and want to bolt down an anchor for a sail or patio set. The drill will hammer and crack whatever is in its way for you. Another thing to consider is whether the chuck is keyed or keyless. Throughout most of industrial history, the greater part of crushing and mining part of the process occurred under muscle power as the application of force concentrated in the tip of the miners pick or sledge hammer driven drill bit. Once you take all your measurements and find the spot you want to drill, cover it with masking tape and mark it with a pencil. Rotary hammers use a bit called a SDS. Concrete is one of the most popular building materials in the world. 24. By using our site, you agree to our. The activities can be matched to appropriate mathematical ability. 4. Although cross-cutting is the majority if not all the cutting that needs to be done as you can just give corrugated iron sheets extra lapping to suit. AGE 6-11 Years They also tend to hold their edge well, which is essential when you need to do a lot of cutting. Plus, it comes with its own carrying case and offers a mid-handle grip design to give you extra balance. INTOO Mini Drill Bit Set 60 Pcs+12 Pcs Free High Speed Steel HSS Titanium Micro Drill Bits 3/64"-1/8" Metal,Plastic,Wood Drill Wood, Plastic, etc. 15 PCS a set diamond drill bits, hole saw core drill style bit. that there is enough charge for the work you have to do, make sure the battery is 5 amp hours (ah) or greater this will give you a good amount of working time. It's also relatively lightweight at only 3.4 pounds. 4. These pieces can sometimes be very sharp and can cause injury or mar the surface of your work-piece. Set the depth. Using manual and electric nibblers requires positioning the tool perpendicular to the sheet metal you are cutting. I like to mark that depth on my bit with a marker or piece of tape. There are a few other tools that dont actually help drill the hole, but make the job a bit easier. Choose one thats right for the type of work you do. Masonry Nail or chisel: These can come in hand for two reason. If the project requires a large diameter drill bit, consider using a smaller drill bit for the pilot hole. It allows you to effortlessly complete many different tasks around your home and in your workshop. Rotary hammers can get quite heavy and bulky as their power and size increases. The drill chuck is the piece that closes around drill bits and holds them in place. The tip of a masonry bit is hard metal that can withstand more heat and pressure. The chuck is also keyless, Has a lock-on button for easier comfort when doing lengthy drilling jobs and a belt clip, The button to lock on the drill only works at full speed, The variable speed trigger is quite sensitive, 1/2 inch keyed chuck to hold the bit securely, Lock-on button to reduce fatigue when drilling for long periods, The additional handle is plastic and may wear over time, Some reviews state that the bits loosen when using the hammer drill mode, Variable speed trigger with lock-on button to reduce fatigue. It includes a variable speed trigger and a soft-grip handle. The lower range RPM also gives you more precision drilling, and the drill is excellent value for the price. Rotary hammers can drill large holes and even bore into concrete. Cuts a variety of shapes accurately in 18 gauge metal sheets. All corded drills have a reverse function. For this reason, a lot of heavier corded drills have an auxiliary handle. Electric shears can cut through metal sheets fairly easily with a straight cut, but they arent very good at cutting around corners, angles, or cutting along the corrugated iron. You can drill into metal using bits for metal by following these 15 steps to drill into metal. Screwdriver bits (farthest right) are useful when using a hand drill to drive screws; they do not drill holes of any kind. Hand tools And its being used more and more as a finish material for things like poured walls, interior floors and even countertops. They dont have an additional function to get them through so youll have to do it manually. The higher the amps of the motor, the more powerful the drill will be this means itll take less time to drill a hole. Most of these relate to the type of projects you want to complete and how often youll use your corded drill. The power of a corded drill is measured in amps. Its also confusing that the smaller a gauge rating the thicker the cutting ability. Make sure the tip of the drill bit is touching the material before you start drilling, and that the drill bit is held at a reasonable angle. It features a metal 3/8 inch keyless chuck for extra durability. With the right drill bit, you can drill through concrete or metal. Our website is supported by our users. Set the depth. Wed love to hear from you. Makita nibbler review | JN1601 vs the cordless XNJ01Z. AGE 6-11 Years ***Disclaimer: This Instructable is not intended to serve as a substitute for hands-on training. Small (about 14 inch or 6.4 millimetres diameter) threaded drill bits and countersinks are common in aircraft metal work. Makita and Hitachi make the best nibblers. If you see sparks or see metal, you have hit rebar. Make sure the tip of the drill bit is touching the material before you start drilling, and that the drill bit is held at a reasonable angle. Why nibblers are the best tool for cutting sheet metal. ENERTWIST Drill Bit Set, 246-Pieces Drill Bits and Driver Set for Wood Metal Cement Drilling and Screw Driving, Full Combo Kit Assorted in Plastic Carrying Case, ET-DBA-246 - - Amazon.com 3.0 out of 5 stars 5/32" masonry bit The drill bits last 3 times longer and drill 2 times faster than standard drill bits.The assorted drill bits have precision ground flutes and points for hole accuracy and fast material removal. The shank is the end of a drill bit grasped by the chuck of a drill.The cutting edges of the drill bit contact the workpiece, and are connected via the shaft with the shank, which fits into the chuck. This action is what gives nibblers their name. Moon Calm Gummies (CBD + CBC) $85 $69. Nibblers can even cut over corrugated metal sheets efficiently, even when cutting at an angle. The reverse function also allows you to remove screws that are bedded in tightly. The cutting point of a nibbler is small enough to fit into holes that are only 0.334 inches, so they are ideally suited for when shears or tin snips dont have the cutting capacity. This 1/2 inch corded impact power drill from Galax Pro has enough power to drill through concrete, wood, and steel. This is a useful function and should be considered when selecting a corded drill. Once you are through, make sure the drill is spinning in the same direction and pull the bit out. Most models can cut 16 to 18 gauge steel fairly easily, although the best models can cut 16 to 10 gauge metal. Such a drill bit is called a reduced-shank or blacksmith's drill. Switch to a special rebar-cutting bit once the drill hits metal. You can use this 3/8 inch drill both for drilling holes and driving screws. Nibblers are most commonly used for cutting corrugated metal. For example 5-pound, 10-pound, etc. Avoid using angle grinders on metal sheets for roofing since they are thin and angle grinders revolve quickly. They can drill into concrete too, if you have the right bit, but they need the power. Setting 2 is high speed and low torque, which is good for drilling holes. Screwdriver bit holder; 18 wood/metal/masonry drill bits; 2 bit holders; 72 bits Technical data; Settings: 21 torque levels + drill setting + impact drill setting; Max. If you need to move around the house smoothly and large tools are out of place, you are in the right place with our high-performance electric tools from the PARKSIDE X 12V Team series. For heavy cutting of roofing, a dedicated nibbler is better. Mark the area with tape and a pencil before drilling. wikiHow is where trusted research and expert knowledge come together. CRF seeks to instill in our nation's youth a deeper understanding of citizenship through values expressed in our Constitution and its Bill of Rights and to educate young people to become active and responsible participants in our society. The water can also help to keep your bit from overheating, which in turn helps keep the bit from shattering. If you have a good drill and bit you can blast right through most concrete in a single try. CRF seeks to instill in our nation's youth a deeper understanding of citizenship through values expressed in our Constitution and its Bill of Rights and to educate young people to become active and responsible participants in our society. Concrete dust can be hazardous to breathe in, so make sure you wear a mask during this process. For drilling small holes into concrete, a standard drill or even a screw gun can do the job. Electric nibblers are the best choice for making fast intricate cuts for sheet metal. In industry, crushers are machines which use a metal surface to break or compress materials into small fractional chunks or denser masses. You can put up shelves, hang paintings, install lights, and do much more quickly and safely. It stands for Slotted Drive System. The drill is well balanced and comfortable to use. (That's what I've learned as a granite fabricator.). The shank must be lubricated with grease to reduce the friction of the sliding action in the chuck. This article was co-authored by Gerber Ortiz-Vega. Adjustable for straight and right and left cutting. Spade bits (second from left) can more easily bore large holes into wood than a twist drill bit, and the holes can either go through the material partially or completely. If your concrete has lots of large aggregate (stone), then it could be much harder to drill through the concrete because you could hit a stone. This 29 Piece heavy duty high speed steel twist drill bit set is made in the USA. For hollow concrete blocks or thin concrete surfaces, check the fastener specifications. This releases some pressure which makes the bit last longer. Slow for anything other than the smallest of metal cutting tasks. Each hex bit drives one fixed size of hex head screw. Keep in mind also that the thickness that a nibbler can cut varies on the material. Why We Liked It: This lightweight Black+Decker corded drill is ideal for the home handy person, and it comes at a good value for money. Save money with a DIY nibbler drill attachment? The tang at the end of the taper provides a positive drive of the drill when the taper fails to grip. A second person holding a vacuum cleaner hose (or half a paper plate taped to the wall) just below the hole you're making may save time on cleaning up after yourself. Adel is one company that continues to manufacture hand nibblers based on standard styles, which are commonly called punch and die nibblers. You may not have heard of nibblers before, even if youve done a fair bit of roofing work but they make the cutexceptionally well. Change direction using the buttons on either side of the handle, just above the trigger. For a small, lightweight drill, this Black+Decker corded drill packs a fair bit of power with a maximum speed of 1500 RPM. DWA1269. 1/2 inch chuck (keyed) for better bit retention, Has a lock-on button for extended drilling time. This is generally not an issue with a rotary hammer since the drills function is always hammering into the concrete. 109/643.57 The cutting edges of the drill bit contact the workpiece, and are connected via the shaft with the shank, which fits into the chuck. These are all tools that perform similar jobs, but there are major differences, benefits, and drawbacks to each of them. Using a bit made from the wrong material can cause the bit or the material you're drilling to break. Need help? These bits have been designed for professional use, meaning they can be used for longer without overheating. A nibbler drill attachment can be a cheaper alternative for DIY enthusiasts. To help pull dust out of the hole while you're drilling, bring the drill back slightly every 10-20 seconds. You should also look at buying a replacement cutter head or 2 so you have them ready for when you need to replace it. INTOO Mini Drill Bit Set 60 Pcs+12 Pcs Free High Speed Steel HSS Titanium Micro Drill Bits 3/64"-1/8" Metal,Plastic,Wood Drill Wood, Plastic, etc. It's designed for extended use with the addition of a button that allows you to lock on the drill. The ergonomic side handle gives you better control as this drill weighs 6 pounds. Once youve reached the required depth, use some compressed air to blow all of the dust out of the hole. Since these drills only vibrate, they can occasionally get stuck on a stone. It also gives the bit a chance to cool. Ive drilled into concrete with a regular drill plenty of times but its harder and takes a bit more pressure. You get the same great case. This allows you to work overhead easily and get into tight spots while still having full control. Best tin snips | Straight cut and corner cutters. Also pay attention to the dial around the chuck of the drill; the numbers indicate torque settings, and are useful when driving screws. You only need a tiny bit for noticeable results. Please don't forget to follow Banging toolbox on: Sounds like this can be improved for the next reader. Black and Gold IMPACT READY Metal Drill Bit Set (12 pc) DD5155. For building and construction however electric nibblers made by Makita, Hitachi and Fein perform better than other metal cutting tools, utilizing good cutting design and power making them the best tool for cutting sheet metal for roofing and building work. As a general rule, lower speeds are more suitable for drilling into hard materials such as steel and concrete, while higher speeds are more adequate for softer materials such as wood. The detail image shows a Morse taper shank on a 16mm diameter drill bit. You also want to consider the weight of the drill, especially if youre going to be using it for an extended period of time. Your corded drill will just keep on going. For larger holes, they probably wont have the power and you may burn out the motor. This hammer drill from Bosch is powerful enough to use at home and on the job site. A corded drill is one of the most useful tools you can have in your tool kit. You can get a nice controlled cut with a good pair of snips, and you can cut across big sheets fairly easily, but only if you are directly cross-cutting the iron sheet. A hex shank can be grasped by a 3-jaw drill chuck or held in a chuck specifically for hex shanks. Some drills have a depth setting or depth control bar. As you get better at using a nibbler, you can try making your cuts to the precise size. With a bit less cobalt in the steel blend, it just heats up a bit more quickly. Compressed air nibblers are usually pretty powerful, but the hose makes it a less portable option. My name is Aaron, and thank you for reading my article. If the torque setting is too high, the screw bit might slip against the top of the screw and you risk rounding off the screw head. You can count on Drill Bit Warehouse for high-quality drill bits, drill bit sets, cutters, and more. Its measured as RPM or rotation speed per minute. The heavier a rotary hammer is the more powerful. Its used to build patios, walkways, sidewalks, driveways, foundations, countertops and even walls. Reduce waiting times by subscribing to our newsletter, full of current offers, promotions, new products and much more. The cord turret can rotate 35 degrees for greater flexibility. When doing work with screws, pilot holes are very important to prevent the wood from splitting. If you have never used a nibbler before, it would be a good idea to practice first on some throwaway of-cuts first before cutting the real work. Traditional drills run into stone issues all the time. Cobalt or titanium [1] tap drill bits are superior to standard drill bits on metal because of their increased durability and ability to drill through tough materials like steel.Utilize center punch to make pre-drilled holes in the metal, especially if you are inexperienced with working with metal. You can even get manual nibblers for small metal artwork jobs, but you should look into a powered model if you are planning on doing any building work like cutting roofing materials as a manual nibbler will be far too slow. Bits for metal might seem a bit expensive to you as they have an excellent quality of cutting steel. But a standard drill can do the job too. Does nibbler damage the form of a corrugated metal sheet? The SDS bit was developed by Bosch in 1975 improving on the TE system introduced by Hilti in 1960. In some cases you may even have to drill through stone aggregates. The Dewalt DWD210G drill is a little heavy (4.9 pounds) to be used one-handed. Has a rubberized grip for comfortable handling. High Performance: 400 in-lbs torque, 2 variable speed setting(0-400rpm&0-1,600rpm), 20+1 torque settings. Or choose a tool that includes extra punches for when they do wear out. So: are you ready for your next DIY project? Why We Liked It: This Bosch corded hammer drill is versatile enough for all applications. You can then create a second finer cut with tin snips easily without the tin-snips jamming. For most residential concrete drilling, a hammer drill is the right tool. Impact drills come in two major types, pneumatic and electric, and vary in size depending on application. The Makita JN1601 16 Gauge 5 Amp nibbler is a better-sized tool for general use and is easier to handle while being a bit cheaper than the 10 gauge version. Rotational drive uses the sliding keyways that open to the end of the shank, which mate with keys in the chuck. Description . Some drills have a depth setting or depth control bar. Slow to use, only for small jobs otherwise you need a proper nibbler. But when you turn it on the drill vibrates as it twists. But even masonry bits are the minimum and really only good for smaller sized holes. Please share how this article can be improved? Call us at (800) 350-8665 for support. Without the right bit youll barely break the surface. 24. Hand drills are one of the most commonly used tools in a workshop, so knowing how to safely operate one is necessary when it comes to prototyping and working on projects. Why We Liked It: This is the perfect lightweight drill for use around the home with its 7 amp motor. Its very hard and helps get through the concrete. Nibblers vs. Electric shears vs. Tin-snips. Dont try and do it all in one shot like you can with a rotary hammer. 5 Pc. Air nibblers and cordless nibblers are your other nibbler cutting options depending on if you want more accuracy or more portability, but electric-powered nibblers are a good in-between. The diameter of the drill bit for the pilot hole should be the same as the diameter of your screw without the threads. The process itself is simple, but selecting the right tools and understanding how to use them will save you a huge amount of time. Last Updated: December 1, 2020 Doesnt include the guides and as many replacement cutter heads that are included in the full kit. The straight shank is the most usual style on modern drill bits, by number manufactured. Joining sheet metal, repairing appliances and driving certain concrete fasteners can all be simplified and sped up by adding a hex bit to your drill kit. Constitutional Rights Foundation (CRF) is a non-profit, non-partisan, community-based organization. Depending on the number of these separate sized fasteners you encounter, you may either need one bit or a set. Concrete drills pulverize the concrete and turn it back into a fine dust. Chun han / Getty Images. 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