G2837 Drill Bushing Bushing Type Head Press Fit H Inside Dia 0.098 In Outside Dia 3/16 In Inside Dia Tolerance +.0001- +.0004 In Outside Dia Tolerance +0.0016 - +0.0006 In Concentricity Tolerance .0003 In T.I.R. Max Overall Length 5/8 In Material 52100 Thru Hardened Finish STEEL Drill Size # 40 Hardness RC 62-64