Bltwell's 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. Will easily outlast every other part on your custom motorcycle. 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 wordmark and anvil logo. The hinge bung mates seamlessly to 1.5" tubing.