High speed steel with cobalt coating. Includes 3/16in.–1/2in. six-step bit, 1/4in.–3/4in. nine-step bit, 1/4in.–1 3/8in. ten-step bit, 3/16in.–7/8in. twelve-step bit, 1/8in.–1/2in. thirteen-step bit.Includes (qty.) 5 Diameter (in.) 3/16-1/2, 1/4-3/4, 1/4-1 3/8, 3/16-7/8, 1/8-1/2 Steps 6, 9, 10, 12, 13
