Gunmetal is one kind of bronze, which is an alloy of copper, tin and some zinc that is basically used for making guns. This bush is made from Alloy steel, stainless steel, and iron materials. Surface finish can be done by Black zinc, copper plating, and other plating methods. The Head style of the gunmetal bushes are different types such as Flat, Oval, Round, Pan, Truss etc. Gunmetal Bushes are used in aero engines, diesel engines, electrical generators and rolling mills.