Vulcan 363741OR Aircraft Twist Drill Bit, High Speed Steel, 1/2" x 12"
$28.31
Highlights: Material : High speed steel Diameter : 1/2" Type : Aircraft, twist Overall length : 12" Shank type : 3-Flat Point angle : 135 deg Point type : Split All 3/16" and larger have 3 flats on the shank so that the chuck gets a better grip on the bit