Choosing the Right Drill Bit for Metal, Wood, Tiles, Glass, or Masonry

Updated on June 27, 2020
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Eugene, an avid self-taught DIYer and engineer, has acquired 30 years of experience with power/hand tools, plumbing, electrics and woodwork.

Boring a Hole: Picking the Best Drill Bit for the Job

When drilling any material, the correct bit is essential so that holes can be bored quickly and with ease. If you are a newbie at DIY, this article explains how to go about choosing the right drill bit for the job when boring through various materials such as metal, masonry, plastics, wood, glass, and tiles. I outline some tips for drilling, the proper way to use a hand power drill, and how drill bits can be sharpened. At the end of the article, you'll find an 11-minute video that shows you how to drill.

A HSS drill bit for drilling steel
A HSS drill bit for drilling steel | Source

Which Drill Bit for Steel or Other Metals?

  • HSS
  • Titanium coated or cobalt steel
  • Metal hole saw
  • Unibit (step bit)

HSS Bits

HSS or high-speed steel bits are made from carbon steel with the addition of other elements such as chrome and vanadium. This allows them to be used at high drilling speeds. HSS bits can be used to drill iron, steel and other metals such as brass, copper and aluminum alloy. They can also be used to drill plastic. You can drill wood with an HSS bit if nothing else is available, however, if the hole is deep or of large diameter, the bit will become excessively hot and drilling progress will be slower.

HSS dril bit
HSS dril bit | Source
Titanium coated bit
Titanium coated bit | Source

Titanium Coated or Cobalt Steel

HSS bits with a coating of a titanium compound are more durable and harder than HSS bits, and suitable for drilling hard materials, e.g. stainless steel. In practice though, the titanium coating eventually wears away, and if you sharpen them with a drill bit sharpener or by hand, the coating is totally lost. Titanium bits look like HSS bits with a brass or orange coloring.

Another option for drilling hard steels or stainless steel are cobalt alloy bits. They are manufactured from solid alloy, not just coated like titanium bits, and sometimes marked HSS Co. The addition of cobalt makes the drills more durable and they can withstand higher temperatures during drilling without losing their edge. The disadvantage is that they are more expensive, more brittle and therefore more likely to chip at the cutting edge. Cobalt steel bits can, of course, be used for drilling "normal" mild steel or other metals.

Step Bit (Unibit)

Step bits are conical shaped with a multiple of cutting edges of varying diameters. They are suitable for drilling thin softwoods, laminates (e.g. plywood) and particle board (chip board), plastics, drywall (plasterboard) and sheet metal. Step bits are ideal for electrical work when varying sized holes have to be cut in junction boxes, panels, etc. The advantage of this type of bit is obviously the convenience of being able to drill a variety of hole sizes without changing bits. Also because the bit generally comes to a point, a pilot hole isn't required as is usually the case if a large hole needs to be drilled.

Step bit also known as a unibit
Step bit also known as a unibit | Source

Drill and Driving Bits Set by Craftsman

This 100 piece drilling and driving set by Craftsman includes all the necessary drill bits for boring holes in wood, plastic, metal and masonry. Ideal for general purpose DIY work around the home, crafts and hobbies. It also has a comprehensive set of driver bits and nut drivers for use with a cordless drill.

Drill and driving set.
Drill and driving set.

Which Drill Bit for Wood?

  • Spade or flat wood bit
  • Lip and spur (Brad Point) bit
  • Hole saw
  • Masonry bit
  • Step bit
  • HSS bit if nothing else available

Spade/flat wood bit
Spade/flat wood bit | Source

Spade or Flat Wood Bit

These are suitable for rapid drilling through wood and are commonly available in sizes from 1/4 inch (6 mm) to about 1 1/2 inches (36 mm). The disadvantage of spade bits is that they can produce a splintering effect as the bit emerges from the timber, if you apply too much pressure.

Lip and spur bit
Lip and spur bit | Source

Lip and Spur (Brad Point) Bits

These are another option for drilling timber and are available in sizes from 1/8 inches (3 mm) to 5/8 inches (16 mm). They can also be used for drilling soft plastic and are less likely to cause melting of the edges of the hole due to friction, which can happen when drilling with an HSS bit.

Quick release clamps are useful for holding a length of timber during drilling
Quick release clamps are useful for holding a length of timber during drilling | Source
Hole saw
Hole saw | Source

Hole Saws

Drilling very large holes greater than 1 1/2 inches with a standard bit is impractical as you would need a drill with a huge amount of power and torque to overcome friction in order to drill through timber. Instead, drilling large holes can be accomplished with a hole saw. This has small teeth like a handsaw and the "blade" is in the form of a cylinder. Some hole saws are only designed for drilling wood or plastic while other versions are made from HSS steel and suitable for drilling iron, steel and other metals in addition to wood.

Which Drill Bit for Plastic?

You can use the same bits as for wood. However, drill slowly. If you drill fast, friction can rapidly cause plastic to melt, clogging the tip and flutes of the drill with melted shavings, especially if the bit is blunt. As shavings cool and get stuck in the flutes, or coat the bit, the problem gets worse and the bit can get stuck. It's not such a big deal when drilling through thin plastic, but I've found that when drilling through thicker sheets and specifically acrylic (commonly known by the brand names "Plexiglass" or "Perspex"), this can be a problem. The same goes for cutting this plastic with a jigsaw, use a slow speed.

Which Drill Bit for Brick, Solid Concrete, Block (Masonry)?

  • Tungsten carbide bit
  • Diamond hole saw

Tungsten Carbide Masonry Drill Bits

These type of bits are used for drilling holes in stone, solid concrete, concrete blocks, brick, and breeze blocks (aerated concrete blocks). They are available in sizes from just under 1/4 inches (5 mm) to 1 1/2 inches (approx. 40 mm).

Masonry bits are available with a round section shank for use in a conventional chuck. However, a better choice is an SDS type bit. The shank on this type of bit doesn't slip in a chuck and can be quickly inserted and extracted from the SDS chuck on the power drill. Masonry bits are used in what is known as an impact, hammer or percussion drill. This percussive or hammering action pulverizes the masonry in contact with the tip of the bit.

Masonry bits can be used for drilling rough holes in timber. However, the hole will be rougher and progress slower. This is because the drill just chips its way by brute force through the wood. A proper wood drill bit shaves its way through timber like a chisel. For construction work though, this isn't an issue.

Masonry bit with SDS shank
Masonry bit with SDS shank | Source
Shank of an SDS drill bit
Shank of an SDS drill bit | Source
Wall plugs fixings (sometimes called "Rawlplugs"), allow cupboards, brackets etc. to be attached to concrete walls.  The max and min size screw is indicated. A tungsten carbide bit is used for making holes.
Wall plugs fixings (sometimes called "Rawlplugs"), allow cupboards, brackets etc. to be attached to concrete walls. The max and min size screw is indicated. A tungsten carbide bit is used for making holes. | Source
Diamond core hole saw
Diamond core hole saw | Source

Diamond Core Bits

These are similar to hole saws but used for drilling large holes in concrete or aerated cement blocks.

Which Drill Bit for Glass and Tiles?

  • Spear head bit
  • Diamond bit

Spear Head Bits

These are made from tungsten carbide and suitable for drilling glass or tiles. When drilling glass, if possible lay it flat on a soft cloth or newspaper for support. Drill at low to medium speed and either spray the area being drilled with water to cool and lubricate the bit, or make a "dam" of plasticine around the area and fill it with water. A piece of tape stuck on the glass or tile helps to prevent the bit from sliding all over the place.

Spear point glass drill bit
Spear point glass drill bit | Source

Diamond Tipped or Coated Bits

These are used for drilling tiles and glass. However, they only have a limited lifespan before the coating of grit wears away.

Diamond coated bits
Diamond coated bits | Source

Are There Different Types and Sizes of Chucks?

The chuck on a cordless drill is usually either 10 mm (3/8 inch equivalent) or 13 mm (1/2 inch). Lower voltage drills (e.g. 12 volts) tend to be fitted with a 10 mm chuck.
Corded drills usually come with a 13 mm chuck as standard, but 16mm (5/8 inch) chucks are also available. Drills bits with a diameter larger than 13 mm normally have a reduced diameter shank so that they can be inserted into a 13 or 16 mm chuck. SDS chucks also come in various different sizes, but the 10 mm SDS-Plus type is the most common version encountered on DIY/ low powered professional SDS power drills.

For more information on chuck sizes and choosing corded and cordless drills, see my guide: A Complete Guide to Power Tools, Corded & Cordless (Drills, Sanders, Grinders, Multitools, Dremels & Saws)

Clockwise from top: Chuck key, keyed chuck, SDS chuck, keyless (hand tightened) chuck
Clockwise from top: Chuck key, keyed chuck, SDS chuck, keyless (hand tightened) chuck | Source

Drill Bit Sizes

Drill bits are available in metric (mm) and Imperial (inch) sizes. HSS drill bits range from 1mm (3/64") to over 25 mm (1"), although smaller diameter bits are available for specialist applications. Bits greater than 13 mm diameter generally have a reduced diameter shank so that they can fit in a 13 mm chuck.

Measuring the Diameter of a Drill Bit

Normally the size is stamped or engraved on the shank of a bit. Unfortunately manufacturers insist on placing the marking near the end of the shank, so it can get worn off over time if a round profile shank slips in a chuck. So you can end up with a lot of unknown size bits in your collection. You can roughly measure the diameter of a bit with a tape or ruler, but a vernier or electronic calipers is the proper tool for the job. You can also use it for measuring thickness of materials, internal hole diameters and general purpose measuring. Resolution is normally about 0.05 mm or 2 thousandths of an inch. You can buy a purely mechanical vernier calipers, which has a vernier scale. Alternatively an electronic calipers displays the result on an LCD scale which can be read directly. The advantage of an electronic calipers is that the display can be read directly, switched between imperial (inch) and metric and the jaws can be zeroed to cope with any drift or wear.

Vernier calipers top and electronic calipers bottom
Vernier calipers top and electronic calipers bottom | Source

This Neiko electronic calipers is recommended as a best buy by Amazon. It has a higher than normal resolution of 0.001 inch (one thousandth) or 0.01 mm and three measuring modes, mm, inch and fractions of an inch. The LCD display is extra large and the body is manufactured from stainless steel (cheap calipers are made from plastic). Currently it retails at $22.43 with free Prime shipping.

How to Hold a Power Drill

Hold the drill with the trigger handle horizontally in the "3 o'clock" position and the side handle in the "12 o'clock" vertical position. If the drill bit sticks, the power drill will turn violently counterclockwise, the side handle will get pushed into the palm of your hand and you may just about be able to hold it before you release the trigger. If you hold both handles in the "6 o'clock" position i.e. pointing vertically down, the side handle of the drill may pull out of your hand. This will almost certainly happen if it is a high power drill without a safety slip chuck. In any case, hold a drill tightly and brace your arms, ready for the unexpected.

Holding a power drill correctly
Holding a power drill correctly | Source

Tips for Drilling Holes

  • Use as slow a speed as possible. In general, the larger the diameter of the drill bit, the lower the speed and vice versa
  • When drilling, back out of the hole every so often to remove material. This prevents the power drill from being overloaded and the bit overheating. This is essential with flat wood bits which don't have flutes (the helical slots on the sides).
  • Lubricate the bit and workpiece with light machine oil if drilling steel. If you're using a pillar drill, you can use an oil can or some form of "squirty" bottle to spread oil into the hole. Alternatively If using a power drill, keep a bottle capful of light oil nearby, and dip the tip of the drill bit every so often into it to cool it. Kerosene or soapy water is suitable for lubricating softer metals such as aluminum or brass which have a more "sticky" swarf (the waste material which spirals out of the drill hole). Diamond drill bits can be lubricated with water. Wood or masonry bits don't need to be lubricated.
  • Don't hold small workpieces while drilling. Make sure they are held in a vice or clamped securely with quick release or G clamps. Otherwise if the bit jams while drilling, the workpiece can spin around uncontrollably. When drilling heavy or fixed objects, this is unnecessary.
  • When drilling plastic, especially acrylic (Perspex), a sharp bit is essential to reduce friction and heat which will tend to melt the plastic and coat/clog the bit, further increasing friction. Use as slow a speed as possible. A lip and spur (brad point) wood bit is best for drilling plastic.

Recommended Hand Cleansers

If you dispense with gloves and work barehanded (which inevitably happens because it's difficult to handle small drill bits and parts with gloves), a hand cleanser will do a better job than soap at removing grime and is pretty much essential for. I use Dreumex anti-bacterial Pumice Heavy Duty Hand Cleaner, available from Amazon for removing oil and grease from my hands. It's also good for removing oil paint, tar, soot and general garden grime. (even used it once for taking black bicycle grease out of a carpet!)

Dreumex Pumice Heavy Duty Hand Cleaner Orange Lotion Bottle
Dreumex Pumice Heavy Duty Hand Cleaner Orange Lotion Bottle | Source

How to Avoid Breaking Drill Bits

Narrow diameter HSS, cobalt or titanium drill bits are easily broken, even by pros, so a little care needs to be taken when using them.

Some tips:

  • Small bits often break when they snag or catch in the workpiece. So if you have a cordless drill, use this instead of a mains corded drill. If the bit snags, the chuck will slip, lessening the danger of snapping the bit. Set the torque setting low and increase the setting if the chuck tends to slip during drilling.
  • Apply light pressure, just sufficient for the swarf to start spiraling away from the workpiece.
  • Try to hold the drill steady. If you move it to one side rather than keeping it perpendicular when drilling, this can bend and over stress the bit, breaking it.
  • Lastly when drilling metal, take it easy as you break through to the other side. The bit can snag as it breaks through and catches the material at the bottom of the hole. Ideally place a block of wood under the workpiece to stop the metal pushing outwards as it thins before breakthrough (this is easier to do if you are using a drill press). With experience you get to know the change in sound and feel the resistance and reaction of the bit as this is about to occur, so ease off on pressure. If bits are sharp, a huge amount of pressure isn't needed to drill a hole. Breakage often occurs when you try to lean heavily on a blunt bit to make it drill quicker, which doesn't work, it only overheats and burns it out!

Small diameter drill bit
Small diameter drill bit | Source

Demagnetizing Drill Bits

Over time, drill bits can become magnetized so they collect shavings while you're drilling. This can interfere with the drilling process by increasing friction, clogging the flutes and getting in the way of the cutting edge so that it can't shave through a hole properly. A demagnetizing tool is a useful gadget for removing magnetism from drill bits, screwdrivers and other tools. Often these de-magnetizing tools can also be used for magnetizing. This is useful for instance for magnetizing the tip of a screwdriver. The tip then holds the screw when you need to drive it in an inaccessible location where you can't fit your fingers.

Drill bits can become magnetized and collect metal shavings, which may interfere with the drilling process
Drill bits can become magnetized and collect metal shavings, which may interfere with the drilling process | Source
A de-magnetizing tool removes magnetism from a drill bit
A de-magnetizing tool removes magnetism from a drill bit | Source

Drill Bit Won't Work?

Apart from the drill bit not being sharp, a common mistake by newbies is to set their drill on reverse so that the bit turns the wrong way. A bit should turn clockwise when looking from the chuck towards the tip of the bit.

How to Sharpen Drill Bits

With some skill, you can learn to sharpen a drill bit on the fine grit wheel of a bench grinder. However the bit needs to be held to the wheel at a relatively precise angle, which takes a bit of practice.

An alternative is to use a sharpening tool like this one by Drill Doctor. These machines are basically composed of a motor driving a small grindstone. To sharpen a drill, you insert it in the appropriate sized hole in the top of the sharpening tool and twist it a few times. This product covers all sizes up to 12 mm or 1/2 inches.

Drill sharpener
Drill sharpener | Source

Can I Use "Normal" Drill Bits With an SDS Drill?

Not directly, but you can fit a standard keyed or keyless chuck. These are supplied with an SDS adapter for fitting into the SDS chuck of the drill. This enables non-SDS conventional round shank drill bits to be used. (or hex shank, flat wood bits). Note that you normally can't use these chucks with hammer action for drilling masonry.

Keyed chuck and adapter for use with an SDS drill.
Keyed chuck and adapter for use with an SDS drill. | Source

A Summary of Materials and Drill Bit Types

(click column header to sort results)
Drill Bit Type  
HSS, Titanium coated, Cobalt Alloy, Step bit, HSS hole saw
Preferably Cobalt for stainless steel or hard steel
Spade(flat bit), Lip and Spur, Auger bit, Hole saw, Step bit, HSS bit
HSS for small to medium sized holes if nothing else available, but use a slow drilling speed
Lip and spur, hole saw, HSS, Step bit
HSS should be used at low speed to avoid melting edges of hole
Masonry bit, Diamond core bit
Ideally use an SDS bit and power drill with an SDS chuck for drilling large holes
Glass and Tile
Spear head, diamond coated bit
Use water for cooling and lubrication

What is a Pillar Drill Used For?

Pillar drills (also known as bench drills, pedestal drills or drill presses) are common machine tools tools in a workshop or industrial setting. They consist of a base that rests on a floor or bench, an attached column, adjustable table that can slide up and down the column (usually with a vice attached), a drill head that drives a spindle and a chuck. A motor inside the drill head drives the spindle via a pulley or gear arrangement. A lever with three or four handles is used to move the spindle and chuck vertically. A pair of pulleys with stepped diameters inside the drill head are connected using a v-belt. By adjusting the position of the belt on the two pulleys, the rotational speed of the spindle can be varied. This control of gear ratio allows high speed, low torque to be selected for small diameter drill bits and vice versa for larger diameter bits.

The bench drill version of the pillar drill is ideal for DIYers because it is more portable and can be located on a workbench.

Pillar drills have several advantages:

  • Holes can be drilled perpendicular to a workpiece without the bit going off course at an angle.
  • The spindle is moved downwards by a lever using a rack and pinion mechanism. The mechanical advantage makes it easier to press the bit into the workpiece than would be the case with a conventional corded or cordless power drill.
  • The vice enables the workpiece to be held securely so it doesn't spin if the bit sticks.
  • Large diameter drill bits can be run at low speed, higher torque by varying belt position. (Lowering the speed on a conventional power drill, just reduces power but torque isn't increased).

A pillar drill.
A pillar drill. | Source

An 11-Minute Video Showing How to Drill Steel, Wood and Masonry

Questions & Answers

  • Which type of drill bit do I need for metals such as nickel and zinc?

    You can use HSS bits, but drill bits are available with a partially ground tip for drilling softer materials such as zinc, aluminum, and nickel.

  • What type of drill bits can be used for metals like copper; especially copper cathode plates?

    You can use an HSS bit or preferably a cobalt split point bit. Use kerosene as a lubricant, drill slowly and advance slowly and retract the bit at regular intervals to help swarf removal. Copper because of its soft, binding nature can clog the flutes in a bit, so it's important not to let this happen. It also has a high coefficient of expansion which can exacerbate binding.

  • What type of diamond bit do I need to use for a broken head metal anchor?

    If this is a drywall anchor and you want to remove it, it may be easier to push it into the wall if there's a cavity behind. Drive in a screw and tap it to push it backwards.

  • Which type of drill should I use for drilling in a needle bore diameter is o.46 to 0.84..?

    If the holes are very small, and the material is hard e.g. stainless steel, you could try using carbide drill bits. These are readily available from electronics suppliers and normally used for drilling pass-through holes in PCBs which are made from glass-reinforced epoxy. Cobalt bits are also available from these suppliers with diameters down to 0.15mm.

  • Why would you say the TiN coating is defeated when sharpening a twist drill bit? These bits are sharpened by removing material from the relief, which does not require the coating to aide the cut only the lifting face.

    The TiN coating surface hardens the drill bit and helps to prevent friction from wearing the core and flutes. However, if the cutting edge is sharpened, the coating is removed in that region. So, that's likely to degrade performance at the tip and cause more rapid wear.

© 2012 Eugene Brennan


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    • eugbug profile imageAUTHOR

      Eugene Brennan 

      9 months ago from Ireland

      That's quite a hole if you want to drill all the way through. It sounds like a job for a pillar drill so that the hole is drilled perpendicular and doesn't go off at an angle. A HSS or cobalt bit would work, but a hand operated power drill would turn too fast for a bit of this diameter (a pillar drill allows you to change belts, reduce speed and increase torque). You could drill slowly if the hand drill has variable speed, but risk burning it out. A drill with a safety clutch is also essential when drilling large holes in case the bit gets stuck. Lubrication/cooling of the bit would also be necessary.

    • profile image

      Akshay Chauhan 

      9 months ago

      which Drill i should prefer if i want to drill through holes of 22 mm Dia into a 2 ft. X 2 ft. X 150mm Solid MS Block

    • eugbug profile imageAUTHOR

      Eugene Brennan 

      16 months ago from Ireland

      Hi Kels,

      Hole saws are only useful if you can drill all the way through (e.g. when drilling through boards) so that the waste can drop out.

      You can use spade bits or auger bits. Spade bits are available to 40 mm diameter and similarly for auger bits. Both can be used with extensions for deep holes.

      If you only need to drill shallow holes, a Forstner bit is probably the best option. These are available in diameters up to 2 1/8". The only issue is the fact that your drilling into the end grain when drilling a stump, so progress may be quite slow.

    • profile image


      2 years ago


      Thanks for the great article!

      I was just wondering.. I am needing to get a drill bit for some hard wood like tree stumps etc. Would I need to get a hole saw drill bit or a spade drill bit ? The stumps are really big and I want to put decent holes in them to put tea lights in them.

      What drills bits and drill would you recommend for this project?

      Thanks for your help!

    • eugbug profile imageAUTHOR

      Eugene Brennan 

      2 years ago from Ireland

      The normal technique for drilling holes in stone and concrete is to use a core drill. Minimum size would be about 20 mm. However you can buy small diamond core bits, similar to the diamond coated bits used to drill glass. Google "small diamond core drills".

    • profile image


      2 years ago

      what type of drill bit to make a big hole in spadikam stones.already have small hole.

    • profile image

      Larry Canada 

      2 years ago

      Great article. Thanks for sharing. Was looking through all my bits and now i know what they are specifically made for

    • profile image

      Vijay Ratnakar 

      3 years ago

      Thanks . I stand much benefited by going through this article and am now in a position to use a drill effectively. In fact this is the only guide from which I have learnt the art of drilling and that too in just one sitting all by myself.

    • profile image


      3 years ago

      Thanks for a great tutorial

    • profile image

      Stephen C Brand 

      3 years ago

      Very helpful, thank you

    • profile image


      3 years ago

      Yeah this was useful.... Thanks for the brief tutorial

    • eugbug profile imageAUTHOR

      Eugene Brennan 

      4 years ago from Ireland

      Hi Gail! Yes you can use any brand of drill bits (although Black & Decker would like you to use theirs!). Some are better quality than others, and cheap bargain basement bits can snap easily or wear out rapidly, especially those used for drilling masonry.

    • profile image


      4 years ago

      Thanks for this useful info. have shared it on facebook. Can I use any brand of drill bits with my about to be purchased Black & Decker?


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