Extra Long Drills 5/16 RHS / RHC HSS 118 Degree Notched Point Extended Length Drill - Steam Oxide Cle-Line List 1807 Extra Length Extended Length Drills Cle-Line Shank Diameter 5/16 inch O.A.Length 18 inch Length Group Extra Long Measurement Type Inch Shank Type Round Cutting Edge Material HSS Decimal Equivalent 0.3125 inch