G2808 Drill Bushing Bushing Type Head Press Fit Inside Diameter 1 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 1 In Material 52100 Thru Hardened Finish STEEL Drill Size 1 In Hardness RC 62-64