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Drilling through sheet metal usually ends one of two ways: the bit skates across the surface scratching your work, or you push hard and the bit snaps. The right drill bit for sheet metal prevents both failures before you start drilling. This guide reviews the 8 best sets, separating real cutting performance from marketing hype so you can match the bit to your drill and material.
I’m Mohammad Maruf — the founder and writer behind Gardening Beyond. This guide is built by comparing the manufacturers’ published specifications and the patterns across verified customer reviews, so you get each pick’s real strengths and trade-offs instead of marketing spin.
Punching clean holes in sheet metal without breaking bits or leaving jagged edges starts with choosing the right drill bit for sheet metal. Your choice depends on three things: cobalt content (which helps the bit resist heat), point geometry (how the tip starts the hole), and the sizes you actually need.
Our Picks at a Glance
How To Choose The Best Drill Bit for Sheet Metal
Sheet metal punishes the wrong bit. A wood bit will chew up your steel panel and come out destroyed. Picking the right metal bit means looking at four things: the steel alloy, the tip geometry, the coating, and the size range you work with. Focus on these four specs when comparing bits.
Cobalt vs. HSS vs. Titanium
The alloy in the bit decides how hot it can run before going soft. Plain high-speed steel (HSS) works fine on mild steel and aluminum but fades fast on stainless. Cobalt M35 steel, which mixes in 5% cobalt, holds its edge at much higher temperatures — exactly what you need for stainless and hardened plate. Titanium-coated HSS is a step up from plain HSS but not a true replacement for cobalt on the hardest jobs.
Point geometry: why split points win
A standard chisel-point bit tends to “walk” or skate sideways when it touches a smooth steel surface. A 135-degree split point has an extra cutting edge in the middle that bites into the metal immediately, so the hole starts exactly where you aimed. On sheet metal, this self-centering tip prevents walking and panel scratches.
Full sets vs. step bits
For your first metal drilling kit, a full set of twist drill bits in 1/16-inch to 1/4-inch or 1/2-inch sizes covers most household jobs. If you regularly need large holes — say for cable clamps, conduit, or sink fittings — a step drill bit (also called a unibit) cuts many different diameters with one tool and leaves clean, burr-free edges on thin sheet metal.
Quick Comparison
| Model | Best For | Material | Pieces | Max Cut Size | Amazon |
|---|---|---|---|---|---|
| RCINDUS 15PC Cobalt Set★ Best Overall | Best Overall — tough hardened steel | M35 Cobalt 5% | 15 | 1/4 inch | Amazon |
| Anfrere Step DrillBest Value | Large holes in thin sheet | HSS Titanium | 10 sizes | 1-3/8 inch | Amazon |
| STROTON 13PC CobaltPrecision Pick | Precise small sizes | M35 Cobalt 5% | 13 | 1/4 inch | Amazon |
| Jerax Step Drill | Impact-driver friendly | M2 HSS Nitride | 13 sizes | 1/2 inch | Amazon |
| LU&MN 10PC Jobber | Razor-sharp starts | M35 Cobalt HSS | 10 | 1/4 inch | Amazon |
| STROTON 17PC Cobalt | Duplicates for spares | Cobalt 5% | 17 | 1/2 inch | Amazon |
| IRWIN 15PC Cobalt | Trusted brand on cars | Cobalt Alloy | 15 | Varies | Amazon |
| MACXCOIP 25PC Metric | Full metric range | M35 Cobalt | 25 | 13mm | Amazon |
Note on sizing: this roundup uses flexible matching for size ranges acceptable on sheet metal, so the exact dimensions can differ from a specific search. The closest same-type size serves the same purpose.
In‑Depth Reviews
1. RCINDUS 15PC Cobalt Set (1/4″)
Our pick — over 4.5★ from 850+ verified ratings; the strongest balance of quality and price.
The budget-friendly cobalt pack that beats pricier single bits on hardened steel.
What wins people over here is the value — the single biggest praise in the owner experience is how much performance you get for the spend. This is a 15-piece set of M35 high-speed steel containing 5% cobalt, the alloy that lets you lean into stainless and cast iron without the bit going dull halfway through. Owners describe it as cheap but say it outperformed a Milwaukee bit, drilling roughly 25 stripped screw heads before losing its edge. That endurance is rare at this price point.
The 135-degree split point does the self-centering work for you, so the tip bites immediately instead of skating across a slick steel surface — a detail that matters every time you start a hole. The bits arrive in a plastic storage case sorted by size, which keeps the smaller, more fragile 1/4-inch diameters from rattling against each other in a drawer. A 4.6-star average across thousands of verified reviews confirms its reputation.
Why owners keep buying
- Real 5% cobalt M35 steel handles stainless and hardened metal
- Split-point tip prevents walking on smooth surfaces
- 15-piece case covers most household sizes
What to know before you drill
- Uncoated finish means you should use cutting oil on hard steel
- Small 1/4-inch bits can snap if you lean on them sideways
Your best daily driver: the set to keep in the drill bag for general metalwork, from stainless lab tops to stripped screws.
Think twice if: you only need one large hole over 1/4 inch — this pack tops out small, so a step bit fits better.
2. Anfrere 10-Size Step Drill (1/4″ to 1-3/8″)
One cone-shaped tool that steps through ten hole sizes in thin sheet metal.
When you need a big hole — a soap dispenser opening, a conduit pass-through, cable clamps — a step bit is the smart play. This Anfrere covers 1/4 inch up to 1-3/8 inches, which is a far wider ceiling than any twist drill set here. The standout real-world story is a buyer who needed a single 1 3/8-inch hole in a stainless steel sink for a soap dispenser; after drilling a pilot hole first, the bit “worked great. Cut fast and clean.” For a tool gapped against standard sets, that is exactly the result you want.
The high-speed steel core carries a titanium coating, which lowers friction so the bit runs cooler as it chews through aluminum, copper, and steel sheet. The double-flute design (two spiral channels) lets metal chips escape instead of clogging the cut, which keeps the hole clean on thin panels. Owners praise build quality and cutting performance, but sharpness varies—best for light sheet metal, not daily stainless work.
One tool, many holes: ideal for DIY and light jobs where you need clean large-diameter holes in steel sheet, aluminum sheet, or copper without buying a full kit.
Honest limit: owners note it is not meant for steel or harder metals — keep it on softer sheets and it will earn its keep.
3. STROTON 13PC Cobalt Set (1/16″ to 1/4″)
Thirteen finely stepped sizes for rivet holes and small precision work.
This set spans 1/16 to 1/4 inch in clean 1/64-inch jumps, so you always have the exact diameter for a rivet or a screw, never a close enough guess. The M35 steel carries a genuine 5% cobalt content and a hardness rating of 68 HRC (Rockwell Hardness Scale — the standard measure of a material’s resistance to indentation). The manufacturer claims that cobalt blend delivers roughly 3 times the heat, wear, and chip resistance of ordinary bits — a marketing claim, but one backed by owners who report cutting through 10.9 hardened steel bolts without breaking.
Functionality is the aspect owners praise most by a healthy margin. The technique that makes these work on hard steel is simple: use oil, go slow, keep firm pressure, stay straight, clear chips, and stop often to cool. Owners note these cobalt bits are a little brittle, so avoid bending or overloading them — no wobbling, no leaning. If you work on small fasteners and exact-size holes, this is the set that eliminates guesswork.
The precision advantage
- 1/64-inch size steps fit exact rivet and screw holes
- Real 5% cobalt with 68 HRC hardness
- 135-degree split point for clean starts
The technique demand
- Brittle cobalt snaps if you bend or overload it
- Small diameters break if you rush on hard steel
Reach for this if: you need exact small diameters for fasteners and are willing to drill with oil and patience.
Look elsewhere if: you mostly drill big holes; the 1/4-inch top size will leave you wanting.
4. Jerax Quick-Change Step Drill (1/8″ to 1/2″)
A 1/4-inch hex shank step bit built to ride in an impact driver.
You can start drilling immediately because the 1/4-inch quick-change hex shank drops straight into an impact driver or a keyless chuck with zero fuss. Owners use it on everything from PVC breaker boxes to 3mm stainless steel. The M2 high-speed steel gets a vacuum heat treatment and a nitride surface hardening, and one owner describes cutting through stainless “like butter” — staying sharp from the first hole to the tenth. Another drilled 8 holes in high-strength steel, with sizes up to 7/8 inch, and the bit stayed sharp the whole way.
Thirteen marked sizes run from 1/8 inch up to 1/2 inch, and the polished steps carry size highlights you can read mid-drill — you know exactly when you have hit your target diameter without stopping to check. Quality is what owners single out most, with functionality close behind. The honest trade-off is longevity on thick steel: at least one owner predicts the edge will fade with heavy use, so treat this as a very capable light-to-mid-duty step bit and save it for the jobs where it shines.
Where it dominates
- Hex shank clicks into impact drivers instantly
- 13 sizes in one tool — no bit changes mid-job
- Non-snagging steps cut clean holes in stainless
The honest caveat
- Longevity on very thick steel is questioned by some owners
- Use cutting oil on hard steel to protect the edge
Best for the impact-driver crowd: electricians and DIYers drilling boxes and panels who want speed and clean holes without changing bits.
Might not suit: continuous heavy stainless work where a dedicated cobalt twist set lasts longer per dollar.
5. LU&MN 10PC Jobber Set (1/4″)
Razor-sharp M35 bits that cut when other “metal” bits only dent.
Buyers report a tool that actually cuts on the first pass. One owner needed 8 holes in a John Deere bucket to mount brackets and worried the bit would dull or break partway; a single bit drilled all 8 and stayed “just as sharp on the 8th as the first.” Another tried these after Black & Decker and Milwaukee bits only dented a metal tube — these “cut right through like you expect a metal bit to do.” That sharpness is the second-most-praised aspect here, behind drill performance.
These are M35 high-speed steel bits with 5% cobalt and a Titanium Nitride finish, plus the 135-degree split point for self-centering starts. The round shank fits standard chucks and drill presses, so they work in almost any workshop setup. The honest split in the reviews is around long-term durability — most owners love the value, but a few report the smaller bits lack the endurance they hoped for, with at least one breaking after a minute of use. This is a sharp, affordable set that rewards careful technique.
What makes it stand out
- Cut right through stainless and metal tube on first use
- 5% cobalt with titanium nitride for heat resistance
- Round shank fits chucks and drill presses
Watch out for
- Durability is mixed — small bits can break under stress
- Don’t overheat stainless or it hardens and eats bits
A confident buy if: you want a sharp, affordable 10-bit set for occasional metal drilling without paying premium prices.
Might disappoint if: you push bits hard on thick hardened plate all day — the endurance is not universal.
6. STROTON 17PC Cobalt Set (1/16″ to 1/2″)
The bigger STROTON kit — duplicates of the fragile sizes you break most.
This 17-piece set extends the same M35 cobalt formula up to 1/2 inch, but the real genius is in the duplicates: you get two each of the 1/16, 3/32, 1/8, and 1/4-inch sizes, the small diameters that snap first when drilling rivets or rocker panels. One owner broke four other bits switching to these for a rivet job, and these worked well — though even this set lost a 1/8-inch bit after 8 holes. The spare means you are not stuck mid-project.
Owner enthusiasm here is hard to overstate. A 76-year-old woodworker calls it the best and highest quality drill bit set he has ever owned, noting the bits stay sharp and leave clean holes in steel and iron plates. Another says these cut stainless “like a hot knife through butter” after DeWalt bits failed. Quality is the most-praised aspect, with the storage case earning its own positive mentions. Durability still draws mixed notes, so bring cutting oil, go slow, and mind your speed for those clean ribbon chips.
Why the duplicates matter
- Two each of the fragile small sizes you break most
- Spans up to 1/2 inch for bigger holes
- Stays sharp through stainless and iron plates
The trade-off
- Durability is mixed — even small bits can break on hard steel
- Higher cost than smaller sets for the same alloy
Pick this if: you break small bits regularly and want spares on hand without ordering singles.
Skip if: you only need occasional small holes — the extra pieces are wasted on light work.
7. IRWIN 15PC Cobalt Set (316015)
The name-brand cobalt set that cuts 3/8-inch plate steel like butter.
IRWIN brings a reputation that precedes it, and the reviews back it up in an automotive context: owners mention drilling multiple 5/16-inch and 3/8-inch holes through 3/8-inch steel plate with an old Milwaukee drill and cutting fluid — the bits “held up great so far.” One owner used these to progressively drill out a sheared bolt, and another praises them after breaking three high-speed steel drills on the same job. Functionality is what owners mention most, followed by value for money.
The redesigned tip promotes long life, and the three-flatted shank is designed to grip tightly in keyless chucks without slipping. The cobalt alloy steel construction handles high-strength steel on cars, and the clear, stackable, accessible case keeps the contents visible for travel. The honest split: some owners find the sharpness and durability mixed, noting they dull or break on the toughest hardened steel. This is a solid, dependable mid-range buy for automotive and general steel work — just not for quenched or fully hardened alloys.
Built for the garage: the reliable pick when you are drilling high-strength steel on cars and want a name you can trust not to fail mid-hole.
Fair warning: owners note it is not suited to hardened steel, and a few found the edge life shorter than hoped — use cutting fluid and let the bit work.
8. MACXCOIP 25PC Metric Cobalt Set (1.0mm to 13.0mm)
Twenty-five metric sizes from 1mm to 13mm in a proper metal box.
If your work runs metric — European appliances, imported cars, small crafts — this set removes the guesswork of converting inches to millimeters. The 25 bits step up in 0.5mm increments from 1mm through 13mm, offering a precision ladder that inch-based sets cannot match. The M35 cobalt construction with a 135-degree point cuts stainless, iron castings, copper, and aluminum, though the maker notes it is not for quenched bolts. The included metal case is a genuine standout: owners specifically praise it as real painted metal, not cheap plastic.
Value for money is the aspect owners praise most, with sharpness a close second — several note the bits arrive sharp from the factory and stay that way through heavy use. One owner describes cutting through metal like butter, while another needed to drill six holes in 1/4-inch mild steel and found a bit went dull halfway through the first. The honest read: this set rewards careful technique with cutting oil and patience on stainless, and the metal case plus full metric range make it a compelling all-rounder for mixed projects.
The full-range advantage
- 25 metric sizes from 1mm to 13mm in 0.5mm steps
- Sturdy metal case with size indexes
- Sharp M35 cobalt with 135-degree self-centering point
Mind the technique
- Bits can dull mid-hole on mild steel without oil
- Requires finesse on super-hardened stainless
Made for metric users: the go-to when your fasteners and fittings are measured in millimeters rather than fractions of an inch.
Not your set if: you work in imperial sizes and never touch metric hardware — the inch sets above serve you better.
Understanding the Specs
Cobalt content and hardness
The “5% cobalt” and “M35” labels tell you the bit can run hot without going soft. Cobalt steel holds its cutting edge at higher temperatures than plain high-speed steel, which is why it is the standard for stainless and hardened metal. A hardness figure like 68 HRC (Rockwell Hardness Scale, the standard measure of resistance to indentation) tells you how hard the steel is, but harder also means more brittle — so never bend or lean on a cobalt bit.
135-degree split point
This tip geometry is the single most useful feature for sheet metal. A split point has an extra cutting edge that bites into the metal immediately, so the bit centers itself and stops “walking” across the surface. If you have ever watched a bit skate sideways and scratch your panel, a split-point bit is the fix — it starts the hole exactly where you aim it with less pressure.
FAQ
Can you use a regular wood drill bit on sheet metal?
What is the difference between a step drill bit and a twist drill bit?
How do I stop a drill bit from walking on smooth sheet metal?
Why do my drill bits dull quickly on stainless steel?
What speed should I use when drilling sheet metal?
Is cobalt better than titanium for drilling metal?
Will a 1/4-inch drill bit set handle most sheet metal jobs?
How do I drill a large hole in sheet metal without a step bit?
Why does my bit keep snapping on metal?
What does 5% cobalt in a drill bit actually do?
Final Thoughts: The Verdict
For most people, the winner for a drill bit for sheet metal is the RCINDUS 15PC Cobalt Set because it pairs genuine 5% cobalt M35 steel with a crowd favorite reputation and a price that undercuts the competition. If you need those big clean holes in thin panels, grab the Anfrere Step Drill for its 1-3/8-inch reach. And for impact-driver users who want one tool for many diameters, the Jerax Quick-Change Step Bit is the one to reach for.
How We Picked
We do not accept paid placement. Every pick is matched to a real buyer and a real use-case; we do not hands-on test units.
Sources & Methodology
Specifications: manufacturer listings and product documentation. Review insights: verified customer reviews, as of September 2026. Pricing: not shown on this page (it changes often); check the current price via the retailer link.
As an Amazon Associate, Gardening Beyond earns from qualifying purchases. This does not affect which products we feature.