IRIrwin
Irwin
Irwin Cobalt Drill Bit Set 29-Piece
- M42 cobalt steel
- 8% cobalt content
- 135-degree split point
- 29-piece 1/16 to 1/2 inch
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On this page
Is the Irwin Cobalt Drill Bit Set 29-Piece worth it?
Yes, for the right buyer. The Irwin Cobalt Drill Bit Set 29-Piece ranks #1 in our Best Drill Bits for Hardened Steel 2026 list (best overall). Its biggest strength: m42 cobalt with 8% cobalt content - highest cobalt grade for hardened steel. The main caveat: set price is high - individual bits available if only specific sizes are needed.
Overview
What the Irwin Cobalt Drill Bit Set 29-Piece does well
One caveat, set price is high - individual bits available if only specific sizes are needed.
Specs that matter
Key features
- M42 cobalt steel
- 8% cobalt content
- 135-degree split point
- 29-piece 1/16 to 1/2 inch
The trade-offs
Pros & cons
Pros
- M42 cobalt with 8% cobalt content - highest cobalt grade for hardened steel
- 135-degree split point starts without a center punch on most surfaces
- Irwin is the benchmark bit brand used by professional machinists
- 29-piece coverage from 1/16 to 1/2 inch
Cons
- Set price is high - individual bits available if only specific sizes are needed
Fit check
Should you buy the Irwin Cobalt Drill Bit Set 29-Piece?
Buy it if you're…
- Shopping for hardened steel 2026
Think twice if this matters to you
- Set price is high - individual bits available if only specific sizes are needed
Where it ranks
Featured in 1 best-of list
| List | Rank |
|---|---|
| Best Drill Bits for Hardened Steel 2026· Best Overall | #1 / 10 |
Cross-shop
Alternatives to the Irwin Cobalt Drill Bit Set 29-Piece
Products ranked near it in our research, each better for a slightly different buyer.
Buying advice: power tools
- Major platforms each cover hundreds of tools. Choose one with the specialty tools you may need later.
- Brushless motors are more efficient and durable. Brushed tools are fine for occasional light use.
- Kits include batteries and a charger. Once you own batteries, bare tools are much cheaper.
- 12V tools are compact for light work. 18V or 20V max tools handle most home projects. Higher-voltage platforms suit heavy cutting.
- Check tool and battery warranty lengths and whether registration is required.
Read the full guides
Answers
Irwin Cobalt Drill Bit Set 29-Piece: common questions
Is the Irwin Cobalt Drill Bit Set 29-Piece worth buying?
Yes, for the right buyer. The Irwin Cobalt Drill Bit Set 29-Piece ranks #1 in our Best Drill Bits for Hardened Steel 2026 list (best overall). Its biggest strength: m42 cobalt with 8% cobalt content - highest cobalt grade for hardened steel. The main caveat: set price is high - individual bits available if only specific sizes are needed.
Who is the Irwin Cobalt Drill Bit Set 29-Piece best for?
Based on our research it suits hardened steel 2026. It's ranked #1 of 10 in our Best Drill Bits for Hardened Steel 2026 list.
What are the downsides of the Irwin Cobalt Drill Bit Set 29-Piece?
The main trade-offs owners and reviewers point to: set price is high - individual bits available if only specific sizes are needed.
What are the key features of the Irwin Cobalt Drill Bit Set 29-Piece?
M42 cobalt steel, 8% cobalt content, 135-degree split point and 29-piece 1/16 to 1/2 inch.
What are the best alternatives to the Irwin Cobalt Drill Bit Set 29-Piece?
Worth comparing: Irwin Cobalt Drill Bit Individual 1/4 Inch, DeWALT DWA1269 Cobalt Drill Bit Set 29-Piece and Bosch CO14B Cobalt M42 Drill Bit Set 14-Piece. Each ranks near it in our research for a slightly different buyer.
Where can I buy the Irwin Cobalt Drill Bit Set 29-Piece?
It's sold on Amazon. Prices and stock change often, so check the current listing before you buy, our link takes you straight to it.
Which drill is more powerful, DeWALT or Milwaukee?
At comparable price tiers, Milwaukee M18 FUEL brushless drills are more powerful than DeWALT XR brushless. At budget tiers (brushed motors), the difference is smaller. For drilling through concrete and hardwood repeatedly, Milwaukee FUEL has the edge. For standard home use (drywall, softwood framing, assembly), the difference is imperceptible.
If I already have DeWALT batteries, should I switch to Milwaukee?
The battery platform transition cost makes switching rarely worthwhile. If you have DeWALT batteries, buy DeWALT tools. The performance difference between professional-tier DeWALT XR and Milwaukee FUEL is real but small, not worth replacing a battery library over.
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