G8663 Drill Bushing Bushing Type Slip Fixed Renewable Combination SF Inside Dia 59/64 Outside Dia 1-3/8 In Inside Dia Tolerance .0002-+.0006 In Outside Dia Tolerance -0.0003 In Concentricity Tolerance .0005 In T.I.R. Max Overall Length 2 1/8 In Material 52100 Thru Hardened Finish Steel Drill Size 59/64 Hardness RC 62-64