Irwin 15104 Step Drill Bit, 3/16-Inch to 7/8-Inch, Titanium Nitrate, 3/8-Inch Shank

Step Drill Bit, Material HSS, Titanium Nitride Finish, Number of Hole Sizes 12, Shank Size 3/8 In., Step Thickness 1/16 In., Size Range 3/16 In. to 7/8 In., Sizes Included 3/16 In., 1/4 In., 5/16 In., 3/8 In., 7/16 In., 1/2 In., 9/16 In., 5/8 In., 11/16 In., 3/4 In., 13/16 In., 7/8 In., Number of Flutes 1, Shank Type Hex, Bit Length 3-1/4 In.