Door closer is a hydraulic device installed on the door head, when the door is opened, by compression and then released, the door will be automatically closed, similar to the role of the spring door, to ensure that the door can be accurately and timely closed to the initial position

A hinge is a mechanical device used to connect two solids and allow relative rotation between them. It usually consists of three parts: the hinge head, the body and the base. Hinges are mainly used to connect and support doors, drawers, cabinets, doors and windows, and other components, to realize the opening and closing and rotation function

A hinge is a part that connects two parts of an object and enables it to move, usually consisting of a pair of metal or non-metallic blades connected by a shaft pin. The main function of the hinge is to make the door or cabinet door can be opened and closed smoothly, and at the same time to ensure its stability and durability.

Door and window hook locks are important hardware accessories used to fix and protect doors and windows, which are mainly divided into two types: sliding window locks and sliding door hook locks. Sliding window locks are usually used for fixing sliding windows. Sliding door hook locks are mainly used for sliding door fixing.