"GAGE,ENDPLAY;ITEM IS USED TO ESTABLISH THE BASE LINE MEASUREMENT AND THEN SET THE GEARBOX 2ND REDUCTION LEVEL GEAR OPERATING END PLAY AND BACKLASH DIMENSION DURING ASSEMBLY;MADE OF HARDENED STEEL, ALUMINUM WITH BLACK OXIDE AND ANODIZE,ADAPTER SIZE IS 6 1/4 IN. X 2 1/2 IN. X 3/8 IN., GASKET SIZE IS 5 1/2 IN. BY 5 IN. X 7/64 IN. AND 5 IN. X 7 IN. X 7/64 IN.,ARBOR AND FLAG SIZE IS 3 IN. X 5/8 IN. X 1 3/4 IN."