Titanium Nitride Coated Drill Bit Set - 21 Pieces

Titanium Nitride Coated Drill Bit Set - 21 Pieces • Set of 21 titanium nitride-coated high-speed steel drill bits. The titanium nitride is tough and very smooth. It reduces friction and heat build-up extending the bit's service life to six times more than regular high-speed steel drill bits. • For a sure grip, all sizes 3/16 in (4.76 mm) in diameter and larger have 3 flats on the bit's shank. • Their 135° split-point tip on all bits 1/8 in (3.17 mm) in diameter and larger eliminates the need for a center punch and keeps the drill from "walking" on hard surfaces.