G8710 Drill Bushing Bushing Type Slip Fixed Renewable Combination Thin Wall SF Inside Dia 6mm Outside Dia 7/16 In Inside Dia Tolerance .0001-+.0004 In Outside Dia Tolerance -0.0005 - -0.0007 In Concentricity Tolerance .0005 In T.I.R. Max Overall Length 3/8 In Material 52100 Thru Hardened Finish Steel Drill Size 6mm Hardness RC 62-64