Introduction to the top of the door:
A door top used to support a door, comprising a bottom plate (1) with an L-shaped cross-section and a slot plate (3) with slot holes (2) installed on the outer side of the long arm of the bottom plate. The lower end of the slot plate is fixedly connected with balls In the device, the long arm of the bottom plate is provided with a screw (7) and a nut (8) for installing the slot plate. When installed at the bottom of the door, it can effectively prevent the door from deflection and deformation.