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.
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Product Features:
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- Corrosion resistant: Black oxide coating provides lubricity and resists corrosion of the bit
- Extreme durability: Thicker web provides greater strength and longer life
- Fast, accurate drilling: 135° split point tip starts on contact to prevent walking, while the parabolic flute clears chips fast










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