"GAGE,CONTOUR,FLANGE;USED TO INDICATE ALLOWABLE AREA FOR REMOVAL OF MATL FROM COUPLING END FLANGE OF P/N 2489968 OR P/N 2494428 INPUT COUPLING ASSY DURING BALANCING OPERATION WHEN OVERHAULING PTO SHAFT BY LOCATING ON FLANGE TO EXPOSE ONLY THE AREA ALLOWED FOR MATERIAL REMOVAL;ITEM WEIGHS APPROX. 1 LB. 14 OZ.,MATL CRES, MEASURES 2 IN. LONG,4 3/16 IN. DIA."