Steel takes the charm out of ordinary bits fast, so your set needs the right alloy, tip shape, and sizing range to keep pace. This roundup focuses on kits that make sense for garage projects, repair work, shop use, and mixed-material jobs where steel is only part of the story. You’ll also see where step bits fit better than twist bits, because the right shape can save time and frustration.
The Shortlist At A Glance
IRWIN Drill Bit Set, M35 Cobalt Alloy Steel, 29-Piece (3018002)
Irwin Tools IRWIN Drill Bit Set, Cobalt Alloy Steel, 15-Piece (316015)
CaRoller 29-Piece Drill Bit Set, 135° Tip, Black and Gold Finish
Milwaukee 48-89-4630 Kit TiN Shockwave (15-Piece Titanium)
RCINDUS 20-Piece 3/16″ Cobalt Drill Bit, HSS M35
WildBossy M35 Cobalt Drill Bit Set 20-Piece
Jerax tools 3/16″-7/8″ M2 Step Drill Bit Unibit
Jerax tools 1/8″-1/2″ Quick Change M2 Step Drill Bit
More Details On Our Top Picks
This 29-piece IRWIN set gives you broad sizing from 1/16 inch to 1/2 inch in 1/64-inch steps, which matters when steel work calls for a precise hole instead of a close guess. The 135-degree split point is meant to reduce walking, so the tip is less likely to skate across metal before it bites. That makes it a steady fit for garage benches, hardware repairs, and jobsite kits that need one case to cover many sizes.
The trade-off is simple, wider coverage usually means you spend a little more time sorting through the case. Still, the jobber length format keeps the bits familiar for standard drill work, and M35 cobalt alloy steel is the kind of material you usually want for tougher drilling tasks. Compared with the smaller IRWIN 15-piece set, this one gives you a lot more range without changing the basic no-nonsense approach.
Strong Points
- Large size spread covers common steel-drilling needs without forcing constant bit changes.
- Fine 1/64-inch steps help you match hole size more closely, which is handy in repair work.
- Split-point tip helps the bit start cleaner on metal surfaces and cuts down on wandering.
- Good fit for a home shop where one compact case has to handle many tasks.
Things To Consider
- A 29-piece case takes more room in a toolbox than a tighter specialty set.
- Like most steel bits, the set benefits from steady pressure and reasonable cutting speed rather than force.
- Storage order matters here, since smaller sizes are easier to misplace during busy work sessions.
Feature Snapshot
Who It Suits Best
Home mechanics and general DIY users who want one steel-focused set for many sizes will get the most from this case.
Where A Sibling Pick Shines
Irwin Tools IRWIN Drill Bit Set, Cobalt Alloy Steel, 15-Piece (316015) suits you better when you want a smaller case with simpler storage.
The smaller IRWIN kit leans into everyday order, with a clear lid that lets you see the contents at a glance and a stackable case that helps in travel bags or crowded shelves. That kind of packaging matters more than it sounds, especially in a garage where bits like to migrate. It also keeps the set easy to carry between a home bench and a worksite cart.
Compared with the 29-piece IRWIN set, this one gives up size range for simpler handling and less clutter. That trade-off works in your favor when you already know the diameter span you use most and want a cleaner storage footprint. The honest read is that it feels better suited to a tidy toolbox than a sprawling all-purpose kit.
What We Like
- Clear lid makes contents easy to spot without opening every compartment.
- Stackable case helps the set travel well and store neatly with other kits.
- Smaller 15-piece layout is easier to keep organized in compact spaces.
- Good match for routine drilling where you rely on a handful of common sizes.
Room For Improvement
- Fewer bits mean less flexibility than the larger IRWIN 29-piece set.
- The compact case is tidy, though it leaves less room for extra accessories.
- Busy jobsite use can make clear lids show scuffs and dust more quickly.
Core Details
Made For
Organized home garages and traveling tool kits benefit most from this smaller, easy-to-store set.
Another Choice May Suit
IRWIN Drill Bit Set, M35 Cobalt Alloy Steel, 29-Piece (3018002) fits you better when wider size coverage matters more than compact storage.
CaRoller goes after the user who wants a wider set with a little more visual polish, thanks to the black and gold finish and a metal indexed storage case. The 135-degree tip helps with placement on surfaces like stainless steel, plastic, and wood, so it suits mixed-material work where your project shifts from one surface to another. That kind of flexibility is useful in a small shop where one kit has to cover more than metal alone.
The trade-off is that the finish and presentation matter most to users who value organization and looks as much as raw utility. Compared with the IRWIN 29-piece set, this one leans more into the visual side of the toolbox while still keeping a practical size range. You may find that combination appealing for light fabrication or repair work where keeping bits sorted matters just as much as carrying them.
Highlights
- 29-piece spread gives you room to handle many common drilling sizes.
- 135-degree tip supports cleaner starts on harder surfaces and mixed materials.
- Metal indexed case helps keep each bit in place and easier to return after use.
- Black and gold finish adds a cleaner visual look inside the toolbox.
Points To Note
- Stylish finish does not change the basic care needs of steel bits.
- The case helps organization, though indexed slots can still collect dust in busy shops.
- It overlaps with the IRWIN 29-piece set, so the main difference is presentation and case style.
Details At A Glance
Whose Shelf It Belongs On
Mixed-material hobbyists and organized home shop users will like the balance of size, finish, and storage.
Skip It When
Milwaukee 48-89-4630 Kit TiN Shockwave (15-Piece Titanium) suits you better when a more compact kit and a tougher work-first feel matter more.
Milwaukee’s compact 15-piece kit is the sort of set that makes sense in a tool bag where every pocket matters. The TiN coating, titanium nitride, is a surface treatment that helps bits stand up better to repeated use, and that matters in shops where you work through metal often. The smaller lineup keeps the case simple, which is handy when you want grab-and-go convenience more than a huge spread.
Compared with the larger IRWIN kits, this one looks more focused and less sprawling, so it can feel easier to manage on a crowded cart. The trade-off is straightforward, fewer pieces mean fewer size choices. Still, for users who keep reaching for the same common diameters, that tighter range can feel just right.
Upsides
- TiN coating adds a tougher surface for repeated drilling sessions.
- 15-piece format keeps the case compact and easy to carry.
- Well suited to routine shop use where the same sizes come up often.
- Simple layout reduces clutter in a bag or drawer.
Minor Gripes
- Smaller assortment gives you less flexibility than the 29-piece kits.
- People who need many incremental sizes may outgrow the set quickly.
- Compact cases are easy to store, though they can be easy to misplace in larger tool rooms.
Quick Facts
Built With In Mind
Frequent shop users who prefer a compact, work-focused kit will get the most from this Milwaukee set.
A Better Fit Elsewhere
IRWIN Drill Bit Set, M35 Cobalt Alloy Steel, 29-Piece (3018002) makes more sense for you when size variety matters more than compactness.
RCINDUS takes a different route from the mixed-size kits above, because this one centers on a 3/16-inch cobalt drill bit format. That makes sense for jobs where you keep returning to one diameter on steel, cast iron, hard plastic, or wood, and you want a stack of replacements ready to go. In a busy workshop, a repeated-size pack can be more useful than a big assorted case.
The compromise is obvious, you get less size flexibility than the IRWIN 29-piece or CaRoller set. Even so, the M35 cobalt construction gives it a work-focused feel, and that can suit users who care more about steady replenishment than variety. You may find the single-size setup a relief in a production-style routine, though it is not the most versatile option here.
Reasons To Buy
- Twenty bits in one size can help you stay stocked for repeated work.
- M35 cobalt build suits harder materials and more demanding drilling jobs.
- Useful for shops where one diameter gets used over and over again.
- Works across steel, cast iron, hard plastic, and wood for mixed task lists.
Softer Spots
- Only one diameter means you will need another set for size variety.
- Single-size packs are practical, though they do not replace an assorted kit.
- Keeping many identical bits organized still takes a labeled storage spot.
Core Details
Who Will Love This
Repair shops and repeat-production workbenches suit this set best, especially where 3/16 inch comes up often.
Look Elsewhere When
WildBossy M35 Cobalt Drill Bit Set 20-Piece fits you better when you want a broader size spread in a single case.
WildBossy feels aimed at harder drilling jobs, with M35 cobalt construction and a jobber-length format that keeps the kit familiar for standard hand drills. The 1/16-inch to 1/2-inch size range gives you enough variety for a serious garage or metalworking bench, and the index storage case makes the set easier to keep sorted. That combination matters when you want a tougher-feeling set without moving up to a bulkier specialty kit.
Compared with the RCINDUS single-size pack, this one is far better for users who need flexibility across many hole sizes. It does ask a bit more from your storage space than the 15-piece Milwaukee set, though the index case helps keep the trade-off manageable. The honest read is that it fits best in a tool chest that sees regular work, not just occasional weekend use.
Best Bits
- M35 cobalt build suits harder materials and repeated drilling sessions.
- 1/16-inch to 1/2-inch range covers a strong spread of common sizes.
- Index case helps keep pieces sorted after a long workday.
- Jobber length keeps the set familiar for standard drill setups.
Areas To Watch
- Sorting and returning each bit matters, or the set can get messy fast.
- The broader kit takes more room than a compact 15-piece option.
- Serious metal work still depends on proper pressure and pace, not just the alloy.
Feature Rundown
Perfect Match For
Home metalworkers and repair-focused garages will appreciate the broader size range and sorted case.
Swap It Out When
Milwaukee 48-89-4630 Kit TiN Shockwave (15-Piece Titanium) works better for you if compact storage matters more than size variety.
This step bit shifts the conversation from individual twist bits to a layered cutting profile, which is useful in sheet metal and other thin stock. A step drill bit, also called a unibit, enlarges a hole in stages instead of boring one fixed diameter, so you can move through multiple sizes with a single tool. That design is especially handy when you want cleaner control on panels, brackets, and electrical enclosures.
Compared with the straight drill-bit kits above, this one trades breadth of material types for faster size changes in metalwork. The 12-size span from 3/16 inch to 7/8 inch gives you a lot of flexibility in one tool, though it is not meant to replace a full cobalt set for heavy steel drilling. You may find it most useful as a companion tool beside a traditional bit kit.
Bright Spots
- Step design lets you move through multiple hole sizes without changing bits as often.
- Well suited to sheet-metal tasks and other thinner workpieces.
- 12-size layout gives useful flexibility from one tool body.
- Good companion to a standard drill-bit set for fabrication work.
Worth Noting
- Step bits are specialized, so they do not replace a full twist-bit kit.
- Best use is thin stock, not the deeper hole work a cobalt set handles.
- Keeping the cutting edges clean after metal dust builds up helps storage and reuse.
Technical Sheet
The Right Fit
Sheet-metal workers, enclosure installers, and hobby fabricators will get the most from this step bit.
Where Another Pick Suits Better
IRWIN Drill Bit Set, M35 Cobalt Alloy Steel, 29-Piece (3018002) suits you better for deeper, general-purpose drilling across many diameters.
The quick-change setup is the main story here, because it cuts down on fiddling in tight workspaces and keeps the bit swap process simple. Like the larger Jerax step bit, this one uses an M2 body and a stepped cutting profile, but the size range is narrower, from 1/8 inch to 1/2 inch. That makes it a tidy choice for light metal work, small enclosures, and jobs where access matters more than a huge diameter span.
Compared with the 3/16-inch to 7/8-inch Jerax bit, this version feels better suited to smaller openings and cramped work areas. The trade-off is less reach on larger holes, which is worth accepting only when your projects stay on the modest side. For regular maintenance work, it can feel like a neat little shortcut.
Best Bits
- Quick-change design helps speed up bit swaps during busy work.
- Compact size range suits smaller hole sizes and confined spaces.
- Step bit layout keeps drilling controlled in thin material.
- Good fit for light fabrication and maintenance tasks.
Small Caveats
- Smaller span limits how far you can go on larger openings.
- Specialized shape is useful, though it still sits beside a full drill-bit set.
- Quick-change convenience matters most in tool systems that already support it.
Feature Card
Built For
Maintenance work, small enclosure drilling, and compact tool setups suit this Jerax bit very well.
Reach For A Different Pick When
Jerax tools 3/16″-7/8″ M2 Step Drill Bit Unibit fits you better when you need a wider stepped range for larger panel openings.
How To Choose The Right Drill Bits For Steel
Start With Bit Material, Not Just The Case
M35 cobalt is the most telling term in this group because cobalt alloy steel is built for harder drilling demands than basic high-speed steel. That matters most on stainless steel, cast iron, and repeated shop use, where softer bits can dull sooner and make the work feel tiring.
High-speed steel still has a place for lighter metalwork and mixed materials. The trade-off is that you usually give up some toughness, so the set makes more sense for general use than for stubborn steel jobs.
Match The Tip To The Job
A split point, especially the 135-degree style found on the IRWIN 29-piece set, helps the bit start where you place it and reduces wandering on slick metal. That small detail pays off when you’re starting holes on punched steel, brackets, or sheet stock.
Step drill bits work differently, because they enlarge a hole in stages rather than cutting one fixed diameter. They’re a smarter fit for thin metal and panel work, while twist bits are the better all-around choice for deeper drilling.
Think About Size Coverage And Storage
A 29-piece set gives you more diameter choices than a 15-piece kit, which helps when projects vary from day to day. Smaller kits are easier to store and carry, though you may reach their limits sooner in a busy garage.
Index cases and clear lids are not flashy extras. They save time, reduce missing bits, and make cleanup easier after a long work session.
Choose For Your Work Pattern
Repair work and home projects usually call for broad assortments, while production-style jobs often reward single-size packs or step bits. That’s the practical split: more variety for flexible tasks, more focus for repeated ones.
Pick the shape that matches your space, too. Tight toolboxes, mobile carts, and small benches each favor a different style of storage and bit access.
Things Worth Knowing First
Hidden Buying Traps
A common mistake is choosing a set only by piece count. A big case sounds useful, but a poor tip shape or the wrong material can matter more once steel starts pushing back.
Another miss is buying a step bit for jobs that really need a deep twist bit. Step bits shine on sheet metal, while standard steel drilling often calls for the broader reach of a cobalt set.
What The Higher Tier Buys
Higher-tier sets usually cost more because the steel blend, coating, and storage case are doing real work, not just dressing up the package. M35 cobalt, TiN coatings, and indexed cases all add to the build and the convenience.
The upgrade pays off most when you drill steel often, work with harder stock, or want a set that stays organized between jobs. For occasional light use, a simpler kit can still be enough.
Frequently Asked Questions
What makes cobalt bits better for steel?
Cobalt alloy bits are built for tougher drilling demands and tend to suit harder metals well. They are a strong fit for jobs where ordinary bits can feel too soft or short-lived.
Do step bits replace regular drill bits?
Step bits help most with sheet metal and controlled hole enlargement. They do not replace a full twist-bit set for deeper or broader drilling work.
Why does a split point matter?
A split point helps the tip start with less wandering on metal surfaces. That makes setup easier when you need the hole to begin exactly where marked.
Is a 29-piece set always better than a 15-piece set?
Not always, because more pieces also mean more storage and more sorting. A 15-piece set can feel better when you use a narrow range of sizes and want a simpler case.
How should you store drill bits for steel?
An indexed case or stackable box keeps the bits easier to sort and return after use. That helps prevent missing pieces and makes the set faster to grab next time.
Closing Thoughts
Your best choice depends less on shiny packaging and more on how you work. Broad cobalt assortments suit general steel drilling, smaller kits suit tidy tool bags, and step bits earn their place on sheet metal and panel jobs. Match the alloy, tip shape, and size range to the tasks that actually fill your week, and you’ll get a set that feels useful instead of crowded. That’s the kind of purchase that keeps paying off every time the drill comes out.
