The Fulton HDPB330101 Fold-Away Bolt-On Hinge Kit converts standard trailer tongues into fold-away configures when preserving the existing coupler while delivering strength at the pivot point with precisely machined heavy duty hinges made from die cast steel. The kit is easy to install with a bolt-on application and complete instructional manual. Install on 3 x 3 steel trailer frames only. Mounting hardware included.