Fulton HDPB330101 Fold-Away Bolt-On Hinge Kit for 3" x 3" Trailer Beam - up to 5,000 lb.GTW Converts standard trailer tongues into fold-away configures while preserving the existing coupler Delivers strength at the pivot point with precisely machined heavy duty hinges made from die cast steel Trailer tongues to be 3 inch x 3 inch outside dimensions with a material thickness between .188 inch and .120 inch Mount Fold-Away products to trailer tongues made only of steel Easy to install bolt-on application with complete instruction manual and includes all mounting hardware