Investment-cast stainless-steel seat hinge is so rugged and beautiful, we know master builders who have taken it with them after selling their personal bike After investment casting, each part is hand polished to a beautiful raw finish A single shoulder bolt passes through the weld-on hinge bung to create a tight flexible hinge interface for solo seats on custom rigid choppers Tastefully emblazoned with the Biltwell Inc. wordmark and anvil logo The hinge bung mates seamlessly to 1.5" tubing