Anyone who has snapped a cheap bit halfway through a stainless bracket knows the frustration. The right high-speed steel set ends that cycle: cleaner holes, less pressure on the trigger, and fewer mid-project trips to the hardware store. This roundup covers five sets built for different shops, from a full fractional-inch index for general work to cobalt packs aimed squarely at hardened steel. Match the set to the metal you actually cut, and each of these earns its drawer space.
The Leading Options At A Glance
Irwin Tools Drill Bit Set, High-Speed Steel, 29-Piece
M35 5% Cobalt Metric Drill Bits Set (1mm-10mm/19pcs)
CaRoller 29Pcs HSS Drill Bit Set, 135 Degree Tip
RCINDUS 15PCS 1/4″ Cobalt Drill Bit, HSS M35
AUYAARS 19 Pcs Hex Shank Drill Bit Set, 1/16″-1/4″
More On The Choices That Made The List
This is the set that lives in most well-stocked home garages, and for good reason. The 29 pieces run from 1/16-inch up to 1/2-inch in tight 1/64-inch steps, so you can match a bit to a tapped hole or a clearance fit without improvising. A jobber-length twist bit is simply the standard spiral-fluted drill bit most people picture; this set covers that whole range in one indexed case.
The black and gold oxide coating resists corrosion, which matters more than it sounds once a case sits through humid summers. In our view, the split-point tip is the real headline here.
Bright Spots
- 135-degree split-point tips bite immediately and resist wandering across smooth stock, saving you from punching pilot dimples first.
- Premium high-speed steel construction stands up to extended drilling in tougher materials without dulling quickly.
- A sturdy metal index case keeps every size visible and sorted, so the right bit takes seconds to find.
- Oxide finish helps the bits shrug off rust during long storage stretches.
Things To Consider
- Plain high-speed steel will still struggle with hardened stainless compared with a cobalt alloy, so manage expectations on exotic metals.
- Owners commonly report the smallest sizes bending if side pressure creeps in; let the tip do the cutting.
Who Should Grab It
Homeowners and general woodworkers who want one complete fractional set covering nearly every household hole they’ll ever need.
Where A Sibling Pick Shines
Metalworkers cutting stainless regularly should step up to the Norseman M35 Cobalt Metric Set instead.
Where the Irwin set covers everyday fractional work, this Norseman-built kit speaks metric. Nineteen straight-shank jobber bits run from 1mm to 10mm, sized for anyone working with imported fasteners, machinery, or automotive parts specified in millimeters. The M35 designation means the steel carries roughly 5 percent cobalt, an additive that raises heat resistance so the cutting edge stays sharp where standard HSS softens.
Viking Drill and Tool manufactures these in St. Paul, Minnesota, a detail that shows up consistently in owner feedback about consistency between batches. That kind of quality control matters when a production line depends on predictable hole sizes.
A Few Highlights
- The 5 percent cobalt blend cuts stainless steel, cast iron, and other hard metals with far less edge wear than plain HSS.
- Straight round shanks suit both keyed and keyless three-jaw chucks without slipping under torque.
- Nineteen graduated metric sizes handle everything from small pilot holes to 10mm anchor points.
Points To Note
- No imperial sizes are included, so US-fraction projects will need a second set alongside it.
- Cobalt bits cost more per piece than standard steel, and careless heat buildup can still ruin an edge.
- Some users note the bits benefit from a slower speed and steady oil feed on thick plate.
Quick Facts
Right Fit For
Machinists, auto techs, and fabricators who regularly drill stainless or cast iron and think in millimeters.
Swap It Out When
General household drilling calls for fractional sizes, which makes the Irwin 29-Piece set the easier companion.
Starting a workshop usually means choosing between a thin starter kit you’ll outgrow and a premium set that stings upfront. The CaRoller threads that needle with a full 29-piece spread from 1/16-inch to 1/2-inch, matching the Irwin set’s coverage at a friendlier entry point. Every bit uses a 135-degree tip angle, the geometry that self-centers on curved or slick surfaces instead of skating off the mark.
You may find the steel grade sits a notch below the cobalt options here for repeated stainless work, but for wood, plastic, aluminum, and mild steel around the house, the honest read is that this set handles it all.
Everyday Advantages
- All 29 fractional sizes arrive in one purchase, eliminating piecemeal bit shopping for years.
- Self-centering tips start cleanly on metal without a center punch in most cases.
- The wide range suits everything from hinge pilot holes to 1/2-inch lag-bolt clearances.
A Few Limitations
- Standard HSS wears faster than cobalt on hardened alloys, so heavy metalwork shortens bit life.
- The storage case is lighter-duty than a metal index; gentle handling keeps sizes organized long-term.
Core Details
Made For
New homeowners, students setting up a first tool bench, and occasional DIYers who want complete coverage without overspending.
Another Choice May Suit
Shoppers wanting a tougher metal-cutting alloy should look at the RCINDUS cobalt pack instead.
Most sets give you one of each size, which is fine until the 1/4-inch bit, the one you reach for constantly, goes dull on a Friday afternoon. This pack flips the formula: fifteen identical 1/4-inch (6.35mm) M35 cobalt bits in a simple plastic case. Anyone running repetitive jobs, think fence brackets, shelving standards, or sheet-metal panels, burns through single bits fast, and having backups changes the rhythm of the workday.
The 135-degree split-point design centers itself on hard surfaces, which matters even more in stainless where a walking bit can mar a finished panel. Compared with the Norseman metric set, this one trades size variety for depth in a single, heavily used diameter.
The Case For It
- Fifteen spare bits mean a dulled edge never stalls a project mid-run.
- M35 cobalt steel drills stainless steel, cast iron, and hard plastics where standard bits stall out.
- The self-centering split point starts accurately on hard, slippery surfaces.
Small Caveats
- One size only, so this complements rather than replaces a full index set.
- The plastic storage case is basic; a labeled drawer tray protects the tips better over time.
Whose Shelf It Belongs On
Fabricators, maintenance crews, and serious DIYers who drill 1/4-inch holes in steel often enough to justify bulk spares.
Reach For A Different Pick When
Varied hole sizes matter more than quantity, and the CaRoller 29-piece set fills that role at lower cost.
Cordless-drill owners know the small annoyance of a round bit spinning inside a worn chuck. Hex shanks fix that: the six-sided end locks into quick-change chucks and standard hex drivers, letting you swap sizes in seconds. This 19-piece set spans 1/16-inch to 1/4-inch in titanium-coated 4241 high-speed steel, a grade tuned for household repairs, woodworking, plastic, and light metal rather than industrial plate.
Against the RCINDUS cobalt pack, these bits trade hard-metal endurance for convenience and versatility around the house. For weekend furniture builds and curtain-rod installs, that’s the right trade.
Practical Advantages
- Hex shanks grip firmly in quick-change chucks and won’t slip like polished round shanks can.
- Titanium coating reduces friction and heat, helping edges stay sharper through repeated light-duty runs.
- Nineteen small-to-medium sizes cover nearly every hole a home repair demands.
Where It May Fall Short
- Coatings on budget sets tend to wear off the flutes over months of use; performance stays but the shine doesn’t.
- The 1/4-inch ceiling excludes larger holes, so big-diameter tasks need a separate set.
Feature Snapshot
Who Will Love This
Casual DIYers, crafters, and apartment dwellers with a compact cordless drill who value fast bit swaps over raw metal-cutting power.
Not Your Match When
Deep steel drilling is the goal, and the Norseman M35 Cobalt Metric Set delivers that endurance instead.
What Matters Most Before Choosing Hss Drill Bits
Material And Coating
High-speed steel is the baseline alloy for twist bits, but additives change everything downstream. Cobalt blends resist the heat that softens plain HSS, while titanium coatings cut friction in softer materials. Match the metallurgy to your most demanding regular task, not your rarest one.
Size Range And Coverage
A 29-piece fractional index handles nearly any household spec, while metric sets serve imported machinery and automotive work. Check the increments too: finer 1/64-inch steps make matching tapped holes far easier than coarse jumps.
Tip Geometry
The 135-degree split point has become the standard for good reason. It self-centers on curved or slick surfaces and starts with noticeably less downward force, sparing both your wrists and your workpiece finish.
Shank Style And Storage
Round shanks suit traditional three-jaw chucks; hex shanks favor quick-change systems common on cordless drills. Then consider the case, since a rigid metal index protects edges and keeps sizes findable for years.
Key Considerations Across These Picks
Traps First Timers Fall Into
The classic error is buying a bargain set with missing intermediate sizes, then discovering the gap mid-project. Another frequent misstep: using plain HSS on hardened stainless and blaming the brand when the edge dulls in minutes. Read the intended materials before committing.
What Separates Premium From Basic
Higher-tier sets pay for tighter manufacturing tolerances, consistent heat treatment, and alloy upgrades like cobalt. That translates into straighter holes, longer edge life, and predictable sizing across batches. Production users recover the difference quickly; casual users may not notice it at all.
Frequently Asked Questions
What does HSS mean on a drill bit?
It stands for high-speed steel, the standard alloy for twist drill bits. It retains hardness at the elevated temperatures drilling generates.
Are cobalt drill bits worth the extra cost?
For stainless steel, cast iron, or frequent metalwork, yes, because they hold their edge far longer under heat. For occasional wood and plastic, standard HSS performs adequately.
Can HSS drill bits cut through stainless steel?
Plain HSS can start holes in stainless with slow speeds and cutting oil, but the edge dulls quickly. A 5 percent cobalt M35 bit is the better tool for that job.
Why do my drill bits keep walking on metal?
A conventional tip angle skates across smooth surfaces before it bites. A 135-degree split-point tip self-centers and largely solves the problem.
How should I store drill bits to make them last?
Keep them dry in an indexed case so edges don’t knock against each other. A light wipe of oil before long storage prevents surface rust.
Closing Thoughts
Every set here solves a different version of the same problem. The Irwin 29-piece remains the safest all-around choice for a home garage, Norseman’s cobalt kit owns metric metalwork, CaRoller stretches a budget across full coverage, RCINDUS backs up the most-used size in bulk, and AUYAARS serves quick-swap cordless convenience. Start with the material you cut most often, pick accordingly, and your next project starts smoother.
