G8474 Drill Bushing Bushing Type Headless Press Fit P Inside Dia 1/2 In Outside Dia 1 In Inside Dia Tolerance .0001-+.0005 In Outside Dia Tolerance +0.0015 - +0.0018 In Concentricity Tolerance .0003 In T.I.R. Max Overall Length 3 In Material 52100 Thru Hardened Finish Steel Drill Size 1/2 In Hardness RC 62-64