G2807 Drill Bushing Bushing Type Head Press Fit Inside Diameter 1-1/64 In Outside Dia 1-3/8 In Inside Dia Tolerance +.0002 - +.0006 In Outside Dia Tolerance +0.0022 - +0.0018 In Concentricity Tolerance .0005 In T.I.R. Max Overall Length 3/4 In Material 52100 Thru Hardened Finish STEEL Drill Size 1-1/64 In Hardness RC 62-64