The Milwaukee 48-89-2726 5/16 in. Thunderbolt Black Oxide Drill Bit with your portable drill (drill not included). This drill bit features black oxide construction for durability and a thick core to protect against side-load breakage. The parabolic flute form helps clear away chips and debris to keep the bit cool, and the secure-grip shank won't slip in the drill chuck.
- Thunderbolt web, provides longer life and faster driller times
- Parabolic flute, clears chips faster
- Black oxide construction for durability
- 135° split point, precision start no walking