Taper Length Measurement Type Inch Coating Black Oxide 15/32 RHS / RHC HSS 118 Degree Notched Point Heavy Duty Taper Length with Automotive Tanged Shank Drill - Steam Oxide Cleveland List 2540 Heavy-Duty Taper Length with Automotive Tanged Shank Drills Tool Diameter 15/32 inch O.A.Length 7-1/2 inch Decimal Equivalent 0.4688 inch Shank Type Round w/Tang Cutting Edge Material HSS Cleveland