- Patented micro-groove cutting edge and spurs produce a smoother hole finish
- Double spur design scribes the hole before the chips are made, producing a cleaner hole and reducing vibration
- All bits have a 1/4" hex shank that fit all drills and 1/4" quick change adapters
![Irwin Speedbor® Standard Length Flat Bits, 1 1/8" X 6", #IR-99918 (12/Pkg) Irwin Speedbor® Standard Length Flat Bits, 1 1/8" X 6", #IR-99918 (12/Pkg)](https://cdn11.bigcommerce.com/s-gdy1ehz/images/stencil/500x659/products/259820/443906/99910__72905.1666379239.jpg?c=2)