The Milwaukee 48-89-2715 9/64 in. Thunderbolt Black Oxide Drill Bit for durability. This black oxide drill bit features a parabolic flute form to help clear debris and chips quickly so the drill bit stays cool, and the thick core helps protect against side-load breakage. This drill bit is recommended for use with portable drills.
- 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