Hitachi 728088 13-Piece Cobalt Drill Bit Set (Discontinued by the Manufacturer) Set includes 1/16-inch to 3/8-inch bits Drill tips penetrate on contact 30-percent faster drilling and triple tempered for added strength Rigorously tested for both performance and durability Comes with a 30-day limited warranty 30% faster drilling 130 degree tip geometry Triple tempered for strength and durability Drill tip penetrates on contact