- Constructed of M-35 5 percent cobalt high speed steel for super abrasive resistance in tough metals
- Heavy duty spiral flute design produces faster chip ejection
- Shorter cutting lips reduce torque for drilling in high tensile strength materials
- 135-degree split point reduces feed pressure for easier penetration without work hardening
![Irwin® Cobalt High Speed Steel Fractional Straight Shank Jobber Length Drill Bit, 5/16", #IR-63120 (6/Pkg) Irwin® Cobalt High Speed Steel Fractional Straight Shank Jobber Length Drill Bit, 5/16", #IR-63120 (6/Pkg)](https://cdn11.bigcommerce.com/s-gdy1ehz/images/stencil/500x659/products/256818/442374/63104__90368.1665755220.jpg?c=2)