Step Drill Bit, Material HSS, Black Oxide Finish, Number of Hole Sizes 3, Shank Size 3/8 In., Step Thickness 3/8 In., Size Range 1/2 In. to 1-1/8 In., Sizes Included 1/2 In., 7/8 In., 1-1/8 In., Number of Flutes 2, Shank Type Three-Flat, Bit Length 3 In.