- Drill bits have 3 cutting edges that are hardened for durability and long life in tough materials
- Replaceable screw-point tip pulls the drill bit fast for clean, true holes
- Drill bit has an aggressive screw pitch
- 7/16-inch hex quick-change impact shank reduces slipping in standard chucks
- IRWIN drill bits are compatible with most 7/16-inch impact drills
![Irwin® Speedbor MAX Self-Feed Wood Bits, 2 1/4", #IR-3046012 (1/Pkg) Irwin® Speedbor MAX Self-Feed Wood Bits, 2 1/4", #IR-3046012 (1/Pkg)](https://cdn11.bigcommerce.com/s-gdy1ehz/images/stencil/500x659/products/259813/447398/3046008__47588.1668461387.jpg?c=2)