Description:Durable Material: Made of carbon steel, the surface is coated with anti-rust oil to prevent rust and corrosion. The material has excellent performance, high temperature resistance, durability, and is not easy to deform, ensuring long-term stability of light and heavy doors.Smooth Operation: The weldable barrel hinges provide smooth and quiet 360-degree rotation, minimize friction, make the door easy to open and close, and reduce wear. Built-in ball bearings can reduce friction and resistance.Easy to Install: Just weld the barrel hinge to the outer frame or door, easy and simple. But note that the welding hinges do not have mounting holes and are only suitable for welding installation, not for fasteners.