Made of high-quality materials, with high strength, reliability, and durability, it is not easy to rust. The automatic closing design has a locking and opening function. When the door opens more than 90 degrees, the steel balls inside the hinge will automatically clamp onto the fixing hole, locking the door in the open state. The three in one function integrates the functions of hinges, door closers, and door stops, making it convenient and easy to use. Comes with self tapping screws for easy installation without the need for additional tools or accessories. There are four sets in one package., Manufacturer: Young Wolf