Milwaukee® Thunderbolt® black oxide jobber length drill bits are designed for extreme durability and long life. The Thunderbolt® web features a thicker core than a standard drill bit, which provides ultimate strength and protects against side-load breakage. A specially designed parabolic flute form clears chips and debris fast to keep the bit cool. A precision start, 135 deg 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. The 3-flat secure-grip shank won't slip in the drill chuck. Reduced shank Dia for use in 3/8 in chucks. 29 piece Thunderbolt® black oxide drill bit set comes with 1/16 in through 1/2 in by 64ths.
Thunderbolt web, provides longer life and faster driller times
Thunderbolt web, provides longer life and faster driller times
135 deg split point for precision start no walking
Parabolic flute, clears chips faster
3-flat secure grip shank, reduces bit slipping in chuck