Made of thick stainless steel, strong and durable. The surface is specially treated to prevent rust and damage. Compared with ordinary hinges, door pivot hinges can support heavier doors. The top pivot has a retractable pin for easy installation. Product features: 360-degree rotation / strong load-bearing to create a way to open the door. Product use: suitable for all kinds of wooden doors, aluminum frame doors, hidden doors, etc., Manufacturer: Shun Yingtong