G8646 Drill Bushing Bushing Type Slip Fixed Renewable Combination SF Inside Dia 10.5mm Outside Dia 3/4 In Inside Dia Tolerance .0001-+.0005 In Outside Dia Tolerance -0.0002 In Concentricity Tolerance .0003 In T.I.R. Max Overall Length 1-3/8 In Material 52100 Thru Hardened Finish Steel Drill Size 10.5mm Hardness RC 62-64