"STEEL,1.575 IN.O/A LG;BORE INCLUDES 4.719 IN.DIABY 1.281 IN.DEEP BEARING SEAT AND A 4.125 IN.DIA BY 0.294 IN.THK RETAINING FLANGE;INCLUDES SIX PLAIN MGHOLES,0.531 IN.DIA AND TWO0.375-16 UNC THREADED HOLES LOCATED ON 1 6.625 IN.CIRCLE;7.875 IN.LARGEST OD"