The Titanium Nitride Coated Drill Bit and Driver Bit Set 115pc features 115 titanium nitride-coated high-speed steel drill bits. The titanium nitride coating is tough and very smooth. It reduces friction and heat build-up extending the bit's service life to six times longer than regular high-speed steel drill bits. Use them for repetitive drilling in most ferrous and nonferrous metals, plastic and wood. Not recommended for use in aluminum or hard metals such as stainless steel. For a sure grip, all sizes 3/16" (4.76 mm) in diameter and larger have three flats on the bit's shank. Their 135 degree split-point tip on all bits 1/8" (3 mm) in diameter and larger eliminates the need for a center punch and keeps the drill from "walking" on hard surfaces. All drill bits with a diameter larger than 3/8" (9.52 mm) are manufactured with a shank reduced to 3/8" (9.52 mm). Complete assortment with 29 fractional sizes, 60 numbered sizes and 26 lettered sizes.

A limited lifetime warranty is available on many products but may vary by product.