Heavy durable weldable hinges are made of good quality steel Cold Rolled Sheet that is durable, sturdy, and long-lasting use.Purpose of using cold rolled sheet for smooth surface than hot rolled sheet and cheaper than stainless steel.Raw Material can be change according to the customer requirement. It is easy to use, perfect for high-stress applications, such as holding up heavyweight gates, doors, and more.These steel hinges are uncoated, and are their natural dark grey. They can be painted to match the metal surface to which they are attached