The Milwaukee 48-89-2740 9/16 in. Thunderbolt Black Oxide Drill Bit features durable black oxide construction. This drill bit is excellent for drilling on curved surfaces and recommended for use with portable drills. The thick core provides protection against side-load breakage.
- 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
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