The urban center 48-89-2717 11/64 in. Thunderbolt Black compound bit options black oxide construction for a protracted life and quick drill times. The parabolic flute type helps clear chips and junk away to stay the bit cool, and also the precision-start, 135-degree split-point tip starts on contact to make sure quick and correct drilling. This bit is superb for drilling on sinusoidal surfaces.
Thunderbolt net, provides longer life and quicker driller times
Parabolic flute, clears chips quicker
Black compound construction for sturdiness
135-degree split purpose, exactitude begin no walking