- 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, 3/8" X 16", Bulk, #IR-99906 (24/Pkg) Irwin Speedbor® Standard Length Flat Bits, 3/8" X 16", Bulk, #IR-99906 (24/Pkg)](https://cdn11.bigcommerce.com/s-gdy1ehz/images/stencil/500x659/products/258147/443894/88706__55682.1666374891.jpg?c=2)