G4661 Drill Bushing Bushing Type Headless Press Fit P Inside Dia 21/64 In Outside Dia 5/8 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 2 1/2 In Material 52100 Thru Hardened Finish Steel Drill Size 21/64 In Hardness RC 62-64