I don't know what it's from, 7" diameter x 3/4" approx 19mm bore two 8mm holes in it.
Large Drive Pulley & Pin for Ammco 3000, 4000, 4100, 7000 & 7100 Brake Lathes
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WINCHMAX WINCH LARGE ALUMINIUM HAWSE FAIRLEAD (BLACK) - LASER ETCHED LOGO