Appearing similar to a barrel, this hinge is easy to install as the joint is simply a hole that is drilled into the work piece. These are generally used for gates and applications having low loads on the radius. It consists of components like a barrel which is a hollow spherical barrel shaped section joined to a pivot for movement. Materials from which hinges are made include: coated steel, polished plated steel, chromium-plated metals, brass, bronze, and aluminum.