G2881 Drill Bushing Bushing Type Head Press Fit H Inside Dia 55/64 In Outside Dia 1-1/4 In Inside Dia Tolerance +.0002 - +.0006 In Outside Dia Tolerance +0.0020 - +0.0017 In Concentricity Tolerance .0005 In T.I.R. Max Overall Length 3/4 In Material 52100 Thru Hardened Finish STEEL Drill Size 55/64 In Hardness RC 62-64