Step Drill Bit, Material Cobalt, Steam Oxide Finish, Number of Hole Sizes 2, Shank Size 7/16 In., Size Range 7/8 In. to 1-1/8 In., Sizes Included 7/8 In., 1-1/8 In., Number of Flutes 1, Shank Type Hex, Bit Length 3-1/8 In.