Step Drill Bit, Shank Size 1/4 In., Number of Hole Sizes 13, Size 1/8 In. to 1/2 In., Step Thickness 5/32 In., Number of Flutes 2, Number of Pieces 1, Shank Type 3 Flat, Point Angle 135 Degrees , Bit Length 37/64 In., Material High Speed Steel, Black Oxide Finish, Design Double Flute, For Drilling and Enlarging Holes in Steel, Stainless Steel, Sheet Metal and Plastic