"GAGE,CONTOUR,FLANGE;USED TO INDICATE ALLOWABLE AREA FOR REMOVAL OF MATERIAL FROM TUBE END FLANGE OF P/N 2497345 INPUT COUPLING ASSY DURING BALANCING OPERATING WHEN OVERHAULING PTO SHAFT,LOCATES ON FLANGE TO EXPOSE ONLY THE AREA ALLOWED FOR MATERIAL REMOVED;ITEM MEASURES 2 IN. LONG,3 5/8 IN. DIA.,MATL. CRES,WEIGHS APPROX. 1 LB. 2 OZ"