Taper Length Measurement Type Inch Coating Black Oxide 17/32 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 17/32 inch O.A.Length 8 inch Decimal Equivalent 0.5312 inch Shank Type Round w/Tang Cutting Edge Material HSS Cleveland