G8708 Drill Bushing Bushing Type Slip Fixed Renewable Combination Thin Wall SF Inside Dia 15/64 Outside Dia 7/16 In Inside Dia Tolerance .0001-+.0004 In Outside Dia Tolerance -0.0005 - -0.0007 In Concentricity Tolerance .0005 In T.I.R. Max Overall Length 1/4 In Material 52100 Thru Hardened Finish Steel Drill Size 15/64 Hardness RC 62-64