G2770 Drill Bushing Bushing Type Head Press Fit H Inside Dia 23/64 In Outside Dia 5/8 In Inside Dia Tolerance +.0001- +.0005 In Outside Dia Tolerance +0.0017 - +0.0014 In Concentricity Tolerance .0003 In T.I.R. Max Overall Length 5/16 In Material 52100 Thru Hardened Finish STEEL Drill Size 23/64 In Hardness RC 62-64