- Drill bit is engineered with M-35-grade Cobalt Alloy Steel for maximum life when drilling in tough steel
- SpeedPoint tip for fast starts
- Drill bits feature a radial concave flute
- IRWIN drill bits have laser-marked sizes for simple identification
- Drills 6 hole sizes from 3/16" to 1/2" increments in 1/16" steps
![Irwin® Cobalt Step Drills, 9/16"-1", 8 Steps, #IR-10220CB (1/Pkg) Irwin® Cobalt Step Drills, 9/16"-1", 8 Steps, #IR-10220CB (1/Pkg)](https://cdn11.bigcommerce.com/s-gdy1ehz/images/stencil/500x659/products/256849/361768/585-10220CB__34071.1595386865.jpg?c=2)