Drill Bushing Bushing Type HL Head Liner Inside Dia 2-1/4 In Outside Dia 2 3/4 In Inside Dia Tolerance +0.0010 +0.0015 In Outside Dia Tolerance +0.0022 +0.0026 In Concentricity Tolerance .0005 In T.I.R. Max Overall Length 1-3/4 In Material 52117 Thur Hardened Drill Size 2-1/4 In Hardness RC 62-64