G8693 Drill Bushing Bushing Type Slip Fixed Renewable Combination Thin Wall SF Inside Dia 3.3mm Outside Dia 1/4 In Inside Dia Tolerance .0001-+.0004 In Outside Dia Tolerance -0.0002 In Concentricity Tolerance .0005 In T.I.R. Max Overall Length 3/4 In Material 52100 Thru Hardened Finish Steel Drill Size 3.3mm Hardness RC 62-64