This ball bearing door hinge can be used on doors weighing up to 40kg and ensures a smoother operation as well as a longer duration. It will provide strength and durability in residential and commercial properties. It is made of mild steel and has a matt black finish which will pair great with painted doors and will not age or tarnish over time. These ball bearing hinges are supplied with 18 screws for a 3 hinge pack and are easy to install.