"ALUMINUM ALLOY,ANODIZE FINISH TY2 CL 1 PSI3201,12.650 IN.O/A LG,3.739 IN. O/A DIA,BORE 0.700 IN. DIA 12.450 IN. DEEP,COUNTER BORE 2.500 IN. DIA 0.995 IN. MIN TO 1.005 IN. MAX DEEP,AS NOTED MACHINED SURFACES 63.0 AND 125.0 MICROINCH FINISH,AS NOTED SHOT PEEN"