Drill bits are cutting tools sized to match both the material being drilled and the drill’s chuck, and using the wrong type is the fastest way to ruin a workpiece.
A stripped-out screw hole in a cabinet door or a chipped concrete slab is almost always the result of grabbing the wrong bit from the box. The fix isn’t a better drill — it’s knowing which bit the job actually calls for. Brad-point bits deliver clean entry in hardwood, HSS twist bits handle metal without overheating, and SDS bits are the only option for reinforced concrete. Matching the bit geometry to the material stops bit wander, prevents cracking, and keeps your work looking finished. This guide covers fifteen bit types, the material each one is built for, and the setup steps that keep your holes on target and your bits sharp.
What Makes Each Drill Bit Type Different
Every bit type solves a specific drilling problem — the wood that splinters, the metal that overheats, the tile that cracks. The bit’s tip geometry, flute design, and material all determine where it works best. Here is the breakdown of the most common types and the job each one owns.
| Bit Type | Best Material | Key Feature |
|---|---|---|
| Brad-Point | Wood | Sharp center tip prevents walking; clean entry and exit |
| Twist (HSS) | Wood, plastic, soft metals | Spiral flutes clear debris; general-purpose up to 1 inch |
| Spade (Paddle) | Wood | Wide flat blade bores holes quickly; good for rough work |
| Auger | Thick timber | Screw tip pulls bit into material; deep clean holes |
| Countersink | Wood, soft metal | Drills pilot hole and recess for screw head in one step |
| Step (Unibit) | Sheet metal, plastic | Conical stepped design drills multiple sizes without changing bits |
| Hole Saw | Wood, metal, tile, masonry | Large round cuts; leaves the core intact |
| Annular Cutter | Metal | Precision burr-free holes; core intact; for metalworking |
| Masonry | Brick, stone, concrete | Tungsten carbide tip; hardened steel body |
| SDS | Reinforced concrete | Heavy-duty; requires rotary hammer drill |
| Core | Reinforced concrete, stone | Hollow diamond or carbide edge; large precise holes |
| Glass | Glass, tile | Carbide tip reduces cracking; often used with water |
| Cobalt | Stainless steel, tough metals | Extremely hard; dissipates heat quickly |
| Carbide-Tipped | Tile, masonry | Stays sharper longer than HSS |
Brad-point and spade bits serve different woodworking needs — brad-point for visible joinery where clean edges matter, spade for running cable through studs. Auger bits pull themselves into thick lumber, making deep holes in posts and beams more consistent. Step bits eliminate the swap-out when you need a dozen different hole sizes in a single sheet of metal. The Lowe’s drill bit buying guide includes a good visual chart for matching bit shape to material.
Which Point Angle Should You Use?
The angle at the bit tip — 118 degrees or 135 degrees — determines how the bit starts the cut. The wrong angle makes the bit wander or requires excessive downward force. 118-degree bits stay centered better and work well on soft materials like wood and plastic. 135-degree bits have a flatter point that resists riding off-center on hard materials like steel, but they often need a pilot hole or a split-point tip to start cleanly. Split-point tips, common on modern bits, actually start cutting at the center of the tip, which eliminates the need for a pilot hole on most jobs.
How to Select and Use a Drill Bit
The three-step process works no matter what material you are drilling. First, match the bit to the material using the table above — brad-point for finish woodwork, HSS twist for mild steel, SDS for poured concrete rebar. Second, check the shank fits your chuck. Most home drills have 3/8-inch or 1/2-inch chucks; a 3/8-inch chuck won’t accept an SDS bit’s thicker shank. If you plan to drill stainless steel or other hard metal often, see the roundup of tested picks for the best bit for drilling stainless steel before you buy. Third, secure the bit — tighten the chuck firmly by hand (keyless) or with the chuck key until the bit stops wiggling. Start drilling at slow RPM for metal and tile; wood and drywall can take higher speed.
Lubrication and Heat Control
Friction creates heat, and heat dulls bits fast. Glass and tile bits need a steady drip of water at the entry point to stop the material from cracking. Cobalt bits for stainless steel run hot but dissipate the heat through the bit material itself — still use cutting oil for the best life and cleanest holes. HSS bits for aluminum and plastic can run dry for short holes; for deeper holes in metal, add a drop of oil every half inch.
Common Mistakes That Ruin Bits and Workpieces
Most drill failures come down to one of four errors. Using spade bits on fine woodworking jobs leaves a rough, splintered edge — switch to a brad-point or Forstner bit. Reaching for a twist bit for a hole over one inch wide strains the drill and produces a ragged opening; use a spade bit or hole saw instead. Drilling reinforced concrete with standard masonry bits stops at the first rebar and can snap the tip; an SDS bit in a rotary hammer is the only safe option. Ignoring the point angle also causes trouble — using a 118-degree bit on hard steel lets the tip skate across the surface, while a 135-degree bit on soft wood without a pilot can drift.
Material and Shank Compatibility
| Material | Correct Bit Type | Chuck or Tool Required |
|---|---|---|
| Wood (fine) | Brad-point or Auger | Standard 3/8″ or 1/2″ chuck |
| Wood (rough) | Spade or Hole saw | Standard 3/8″ or 1/2″ chuck |
| Mild steel | HSS twist (118° or 135°) | Standard chuck; use pilot hole for hard |
| Stainless steel | Cobalt or Carbide | Standard chuck; low speed, cutting oil |
| Brick / block | Masonry | Standard drill with hammer function |
| Reinforced concrete | SDS | Rotary hammer drill only |
| Glass / tile | Glass or Carbide-tipped | Standard chuck; water lubrication |
| Large concrete openings | Core (diamond or carbide) | Rotary hammer or core drill rig |
Shank compatibility is the hidden second gate. SDS bits use a grooved shank that locks into a rotary hammer’s chuck; a three-jaw standard chuck cannot hold them. Core bits for large concrete openings often need a pilot bit and a specialized arbor. Before you buy any bit, check both the shank style and the label on the drill you plan to use.
Match the Bit to the Machine
Not every drill works with every bit. A standard handheld drill delivers the right torque for HSS twist bits, spade bits, and hole saws up to about three inches. A drill press gives the stable vertical feed that brad-point bits and annular cutters need for precision. Impact drivers accept only hex-shank screwdriver bits, not round-shank twist bits. Rotary hammer drills are the only machines rated for SDS and core bits — the hammering action is what breaks concrete and rebar; a standard drill’s hammer mode cannot deliver enough force.
FAQs
Can I use a wood drill bit on metal?
A brad-point or spade bit designed for wood will not cut cleanly through metal and may dull or snap. Use an HSS twist bit for thin sheet metal or a cobalt bit for thicker steel. The cutting geometry for metal requires a steeper point angle and harder steel.
How do I stop the bit from wandering at the start?
Use a brad-point bit for wood or a center punch to make a small dimple in metal before drilling. Starting at slow speed with a split-point bit also helps control the entry. The centering tip on brad-point bits virtually eliminates drift in wood.
Are cobalt bits worth the extra money?
Cobalt bits cost more than standard HSS but are the right choice for drilling hardened metals like stainless steel. They stay sharper longer and handle the high heat generated at low RPM. For occasional mild steel or wood work, standard HSS bits are adequate.
Can I sharpen dull drill bits at home?
Standard HSS twist bits can be resharpened on a bench grinder using a drill bit sharpening jig. Cobalt and carbide-tipped bits require a diamond wheel and are harder to sharpen without proper equipment. Most users replace cobalt bits once they wear down.
What does SDS stand for on a drill bit?
SDS stands for Slotted Drive System or Special Direct System, referring to the grooved shank that locks into a rotary hammer drill’s chuck. The design allows the bit to hammer while rotating, which is necessary for drilling into reinforced concrete. It does not fit standard drill chucks.
References & Sources
- Lowe’s. “Drill Bits Buying Guide.” Detailed match of bit types to materials with tip-angle recommendations.
- FindBuyTool. “Master Types of Drill Bits and Their Uses.” Covers bit types including brad-point, spade, auger, and hole saw.
- Toolstation. “Drill Bit Buying Guide.” Describes twist, spade, step, and masonry bits with material selection.
- MAF Pro. “Types of Drill Bits: Uses, Materials and How to Pick the Right One.” Advice on SDS and glass bits with safety notes.