Drilling clean holes in hard metal can turn a simple job into a frustrating one fast. You need bits that stay centered, cut with less wandering, and fit the kind of work you actually do, from stainless brackets in a garage to repeated runs on a shop bench. This roundup focuses on cobalt options that make sense for everyday DIY, repair work, and heavier metal tasks without overpromising what any one set can do.
Quick Look At The Shortlist
IRWIN Drill Bit Set, M35 Cobalt Alloy Steel 29-Piece
Irwin Tools IRWIN Drill Bit Set, Cobalt Alloy Steel 15-Piece
Norseman Drill Bits 44170 Ultra Dex Type 240-UB Jobber Set
Narwhal 1/2 Inch Cobalt Drill Bits 3-Pack
CaRoller Cobalt Drill Bit Set 29-Piece M35 Cobalt Steel
Milwaukee 48-89-4630 Kit TiN Shockwave 15-Piece
(20PCS) 1/8″ Cobalt Drill Bit, HSS M35 Metal Drill Bits
Drill America DWDCO7P12 #7 Cobalt Drill Bit Pack of 12
More Details On Our Top Picks
The wide spread from 1/16 inch through 1/2 inch gives you room for pilot holes, hardware prep, and larger metal openings without jumping between separate kits. The 135-degree split point, meaning the tip is shaped to start with less wandering, matters in steel sheets and brackets where a bit that skates wastes time. For garage repairs or a home workshop, that balance feels reassuring.
Compared with the smaller Irwin 15-piece set later in this roundup, this one leans harder into range and flexibility. The honest trade-off is simple, a bigger set takes up more drawer space and can feel more than you need for occasional light drilling.
Strong Points
- Broad size range supports many jobs.
- Split-point tip helps reduce walking on metal.
- Good fit for mixed repair work.
- Covers both small pilots and larger holes.
Things To Consider
- The case will take more room than a compact set.
- Occasional users may not need every size.
Core Details
Who It Suits Best
Home mechanics and weekend fabricators who want one set for many hole sizes will get the most out of this lineup.
A Better Fit Elsewhere
Drill America DWDCO7P12 #7 Cobalt Drill Bit Pack of 12 suits steady repeat-size work better, especially in a shop that keeps reaching for the same diameter.
A smaller set can be the calmer answer for tool bags that already feel crowded, and this Irwin package leans into that idea with a clear-lid case. Being able to see the contents without opening everything up helps in busy garages or service trucks, where quick sorting matters more than a giant size spread. The stackable case also makes storage simpler, which sounds minor until your shelves start filling up.
Compared with the 29-piece Irwin set, this one is easier to carry and easier to tuck away, but it gives up breadth. For routine fastening prep, panel work, or light fabrication, that trade can feel perfectly sensible.
What We Like
- Clear lid makes contents easy to spot.
- Stackable case supports neater storage.
- Smaller footprint suits tight toolboxes.
Softer Spots
- Fewer pieces mean less size coverage.
- Less flexible than larger mixed sets.
Feature Card
Who Will Love This
Mobile techs and home users with limited storage will appreciate the tidy footprint more than a larger spread of sizes.
Another Choice May Suit
IRWIN Drill Bit Set, M35 Cobalt Alloy Steel 29-Piece is the better fit for mixed-hole jobs that need more diameter options in one box.
Norseman’s jobber set has a more shop-first feel than the two Irwin options, with the Ultra Dex Type 240-UB line built for serious drill press or hand-drill use. The 135-degree split point helps on harder surfaces, and “jobber” here means a standard-length twist drill, which usually gives a practical balance of reach and control. In a metalworking setup, that balance matters more than flash.
You may find this set especially appealing when consistent hole quality matters across many repeated tasks. The trade-off is that the premium feel makes more sense for regular use than for an occasional shelf-hanging project.
Highlights
- Jobber length suits general shop drilling.
- Split point supports cleaner starts on metal.
- Strong fit for frequent bench use.
- Well suited to repeat work.
Room For Improvement
- More capable than casual tasks usually need.
- Best value shows up with regular use.
Technical Sheet
Built With In Mind
Metalworkers and serious garage tinkerers who drill often will get the most out of the more refined feel here.
Where A Sibling Pick Shines
CaRoller Cobalt Drill Bit Set 29-Piece M35 Cobalt Steel fits better for a mixed-material toolbox where the set needs to cover steel, wood, plastic, and sheet metal without leaning so hard into shop formality.
Large-diameter drilling changes the conversation fast, and this Narwhal set is built around 1/2-inch work rather than broad versatility. The 6-inch length gives extra reach for thicker stock or awkward access points, while the 135-degree split point helps the bit settle in without skating across the surface. For metal fencing, fabrication, or repair work on heavy brackets, that focus is useful.
Compared with the more general-purpose sets above, this one is for a narrower job and knows it. The main drawback is equally clear, a three-pack does not replace a full range of sizes, so it belongs beside another set instead of standing alone.
Reasons To Buy
- 1/2-inch size fits larger hole needs.
- Long reach helps in thick material.
- Split point aids steadier starts.
- Good match for heavy fabrication tasks.
Points To Note
- Limited to one diameter.
- Best as a specialty add-on.
- Long bits need careful storage.
Details At A Glance
The Right Fit
Fabricators and repair jobs that call for larger holes in hard metal are the natural match for this set.
Look Elsewhere When
IRWIN Drill Bit Set, M35 Cobalt Alloy Steel 29-Piece is the easier choice for anyone who needs a fuller spread of diameters in one case.
This CaRoller set looks aimed at the kind of person who wants one case for steel, wood, plastic, and sheet metal without building a separate collection. The round-shank design, meaning the smooth cylindrical end that fits the drill chuck, keeps it broadly compatible with standard handheld drills and drivers. The included cup-style holder also makes bench storage simpler, which is handy in a garage that already has too many loose bits.
Compared with the more shop-focused Norseman set, this one feels more mixed-use and less specialized. The trade-off shows up in the plain way most budget-minded kits do, you get flexibility first, but the finishing feel may not satisfy someone who drills metal every day.
Best Bits
- Works across several common materials.
- Round shank fits standard drills.
- Cup-style holder helps keep pieces together.
- Good all-around kit for home tasks.
Areas To Watch
- More general than specialty drill sets.
- Storage holder is practical, not fancy.
- Metal-only users may want a more focused set.
Feature Rundown
Made For
Home projects and mixed-material repair work suit this set better than highly specialized metal-only workflows.
Swap It Out When
Norseman Drill Bits 44170 Ultra Dex Type 240-UB makes more sense for a workshop that wants a more refined, drill-press-friendly feel.
This Milwaukee kit sits a little outside the cobalt theme, but it still belongs in a cobalt drill bit roundup because it speaks to the same metalworking use case. TiN means titanium nitride, a hard surface coating that helps drill bits stand up better to repeated use, and the Shockwave line is built for tool-heavy work. For people who drill often and care about a jobsite-ready kit, that matters more than brand chatter.
Compared with the cobalt sets above, this one is the more obvious step-up choice for frequent use rather than occasional cabinet work. The trade-off is straightforward, it’s not the most focused fit for someone who wants a pure cobalt lineup and nothing else.
Upsides
- Coated design suits repeated drilling.
- Good match for jobsite use.
- Smaller 15-piece kit stays manageable.
Minor Gripes
- Not a cobalt-only set.
- Less aligned with a pure cobalt search.
- More of an upgrade than a starter kit.
Quick Facts
Who Should Grab It
Frequent DIYers and light trade users who want a sturdier general drilling kit will get the most from this set.
Reach For A Different Pick When
IRWIN Drill Bit Set, M35 Cobalt Alloy Steel 29-Piece is the cleaner fit for someone who wants cobalt front and center.
A 1/8-inch set like this makes a lot of sense for pilot holes, small hardware, and repeat drilling in hard material. HSS, meaning high-speed steel, is the base metal type, while the M35 cobalt blend points to a harder-duty recipe for steel, stainless steel, cast iron, hard plastic, and wood. In a small shop, that sort of targeted size can be more useful than a full drawer of mixed diameters.
Compared with the broader IRWIN 29-piece set, this RCINDUS option is much more specialized around one size. That can be a strength for the right job, though it also means you’re not getting much range in exchange for the added count.
Bright Spots
- Useful for 1/8-inch pilot work.
- Handles several common materials.
- Good choice for repeat small holes.
- Handy for drawer or pouch carry.
Small Caveats
- Only one size is represented.
- Better as a specialist kit than a full set.
- Small bits need careful storage to avoid loss.
Feature Snapshot
Best Suited To
DIYers who keep reaching for the same small size in metal, plastic, or wood will appreciate the focused pack.
Where Shoppers Go Wrong
Drill America DWDCO7P12 #7 Cobalt Drill Bit Pack of 12 is the better match for people who want a single-size industrial pack in a different diameter.
This Drill America pack is built around one size, the #7 bit, which makes it useful in setups where you keep repeating the same hole diameter. That kind of focus can be a real time saver in fabrication, maintenance, or fixture work, especially when you already know the fastener size you need to match. The DWDCO series is a straightforward industrial-style line, nothing flashy, just purpose-built.
Compared with the RCINDUS 1/8-inch pack, this one serves a different repeat-size need and feels a little more shop-specific. The trade-off is obvious, a twelve-pack is excellent for consistency, but it won’t help much when you need variety.
Reasons To Buy
- Great for repeated #7 holes.
- Pack of 12 supports ongoing use.
- Simple fit for industrial-style work.
Worth Noting
- Only one diameter is included.
- Less flexible than mixed-size sets.
- Best for tasks with a known bit size.
Core Details
Whose Shelf It Belongs On
Shop users who keep making the same hole size in metal will get the most value from this focused pack.
Another Choice May Suit
IRWIN Drill Bit Set, M35 Cobalt Alloy Steel 29-Piece is the better all-round option for anyone who needs more size coverage in one case.
How To Choose The Right Cobalt Drill Bits
Match The Bit To The Material
Cobalt drill bits shine most clearly on hard metals, especially stainless steel and cast iron, because the alloy can stand up better to heat and abrasion than plain high-speed steel alone. The key idea is simple, harder stock needs a tougher bit, and a split-point tip helps keep the bit from skating at the start. For softer materials like wood or plastic, the same bit still works, but you may be paying for capability you rarely use.
Pay Attention To Size Range
A broad set like the IRWIN 29-piece option gives you flexibility for pilots, clearance holes, and larger openings in one case. A single-size pack such as the Drill America #7 or RCINDUS 1/8-inch set makes more sense when your work repeats the same diameter over and over. That choice matters in a garage, because the wrong size spread can leave you carrying more steel than you need.
Think About Storage And Handling
Case design matters more than people expect, especially in a toolbox that gets moved around. Clear lids, stackable cases, and simple holders make it easier to spot missing bits and keep sizes sorted after a long project. Smaller sets are easier to store, but larger sets usually feel calmer to use because you are less likely to stop mid-job hunting for the next size.
Choose For How Often You Drill
Occasional home repair work usually does fine with a modest set, while frequent drilling in metal points you toward a more refined line with better layout and more deliberate construction. The Norseman set makes sense for that heavier rhythm, while the CaRoller kit suits mixed home tasks better. In practice, the right choice is the one that matches your routine, not the one with the biggest count.
A Quick Reality Check Before You Decide
Common Shopping Slip Ups
A lot of set frustration starts with buying too much variety when you really keep using one or two sizes. Another common miss is overlooking the case, then ending up with loose bits rolling around a drawer like marbles. Keep your actual projects in mind, because that makes the choice cleaner than staring at a long size chart.
The Case For Spending Up
Higher-tier bits usually cost more because of tighter machining, better tip geometry, and finishes that suit repeated metal work. That matters most in a shop setting or for anyone drilling stainless parts often, since steadier starts and cleaner holes save time on each job. For occasional use, a midrange set often makes more sense, and that’s fine.
Frequently Asked Questions
Are cobalt drill bits only for metal?
No, you can use them on wood and plastic too. They make the most sense on harder materials where heat and wear become more of a problem.
What does M35 mean?
M35 points to a cobalt-alloy steel blend used in many harder-duty drill bits. It helps signal a set that’s meant for tougher work than basic steel bits.
Why do split-point tips matter?
A split point helps the bit start more centered and reduces wandering on contact. That is especially useful on slick metal surfaces.
Do I need a full set or a single-size pack?
A full set suits general repair and mixed jobs. A single-size pack fits repeat tasks where you already know the exact hole size you need.
How should you store cobalt drill bits?
A labeled case or organizer works best because it protects the cutting edges and keeps sizes easy to find. Loose storage usually leads to lost bits and more wear on the tips.
Final Thoughts
You get the best results from cobalt drill bits when the set matches the work in front of you, not just the largest spec sheet. For mixed home projects, the IRWIN 29-piece set is easy to live with, while the Norseman and Milwaukee options make more sense as you move toward heavier, repeat drilling. Small focused packs, like the Drill America and RCINDUS picks, are smart when you already know your favorite sizes. Choose the shape of tool that fits your real bench, and the work feels a lot smoother.
