Master Mechanic, 13 Piece, Cobalt Drill Bit Set, Contains 1/16", 5/64", 3/32", 7/64", 1/8", 9/64", 5/32", 11/64", 3/16", 13/64", 7/32", 15/64", 1/4", 135 Point, 3 Flats On Shank Reduce Slipping In The Chuck, Cobalt Is Ideal For Drilling Into Stainless Steel & Other Hard Metals. Recommended For Drilling Wood, Plastic & Other Soft Metals, Organized In A Durable Case, Clamshell.