The Milwaukee 48-89-2739 17/32 in. Thunderbolt Black Oxide drill bits are designed for extreme durability and long life. A specially designed parabolic flute form clears chips and debris fast to keep the bit cool. A precision start, 135° Split Point tip starts on contact to keep the bit from walking for fast accurate holes. Excellent for drilling on curved surfaces, requires less effort to drill and is highly 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
Liana Olson (verified owner) –
I used this to drill a hole through a piece of 1.5 inch aluminum bar stock and it work great.