Best Overall
Irw in Cobalt Drill Bit Set 29-Piece
Irwin
M42 cobalt with 8% cobalt content - highest cobalt grade for hardened steel
- M42 cobalt steel
- 8% cobalt content
- 135-degree split point
- 29-piece 1/16 to 1/2 inch
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
- Irw in 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
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