- 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 1/4" X 6", #IR-99920 (12/Pkg) Irwin Speedbor® Standard Length Flat Bits, 1 1/4" X 6", #IR-99920 (12/Pkg)](https://cdn11.bigcommerce.com/s-gdy1ehz/images/stencil/500x659/products/258825/456930/Untitled_design_-_2023-02-13T135610.901__18792.1676387897.jpg?c=2)