the door closing hinges on the door by coming screws This door closing hinges is to reduce the intensity when you close door to protect door from damaging and reduce the noise Designs to convert hinged Door into Closing for added convenience and spring door closing hinges with smooth closing technology removes the bounce from your closing door and allows you to get through with ease Suitable for right and left opened door, wood and metal door, residential and commercial door, exterior / interior door closing hinges, door Make from aluminum alloy, this door features tight arm connection point and adjustable closing force, ensuring high and long terms use, Manufacturer: Xjdzineq