G2759 Drill Bushing Bushing Type Head Press Fit H Inside Dia 6.4mm Outside Dia 13/32 In Inside Dia Tolerance +.0001- +.0005 In Outside Dia Tolerance +0.0015 - +0.0012 In Concentricity Tolerance .0003 In T.I.R. Max Overall Length 1-3/8 In Material 52100 Thru Hardened Finish STEEL Drill Size 6.4mm Hardness RC 62-64