G2788 Drill Bushing Bushing Type Head Press Fit H Inside Dia 0.348 In Outside Dia 3/4 In Inside Dia Tolerance .0001-+.0005 In Outside Dia Tolerance +0.0014 - +0.0017 In Concentricity Tolerance .0003 In T.I.R. Max Overall Length 1-3/4 In Material 52100 Thru Hardened Finish STEEL Drill Size S Hardness RC 62-64