- Drill bit is engineered with M-35-grade Cobalt Alloy Steel for maximum life when drilling in tough steel
- Drill bits feature a radial concave flute
- IRWIN drill bits have laser-marked sizes for simple identification
- Drills 13 hole sizes from 1/8 inch to 1/2 inch in 1/32-inch increments
![Irwin® Cobalt Step Drills, 7/8"-1 1/8", 2 Steps, #IR-10239CB (1/Pkg) Irwin® Cobalt Step Drills, 7/8"-1 1/8", 2 Steps, #IR-10239CB (1/Pkg)](https://cdn11.bigcommerce.com/s-gdy1ehz/images/stencil/500x659/products/257187/448241/10239CB__27074.1668723505.jpg?c=2)