G2806 Drill Bushing Bushing Type Head Press Fit H Inside Dia 47/64 In Outside Dia 1-3/8 In Inside Dia Tolerance +.0001- +.0005 In Outside Dia Tolerance +0.0022 - +0.0018 In Concentricity Tolerance .0005 In T.I.R. Max Overall Length 1/2 In Material 52100 Thru Hardened Finish STEEL Drill Size 47/64 In Hardness RC 62-64