A door, a building entrance or exit, or a device that can be opened and closed at the entrance and exit, is an entity that divides a limited space and can connect and block the entrance and exit of two or more spaces. Doors can be classified into interior doors and exterior doors. Functionally speaking, interior doors generally refer to bedroom doors and office doors, and exterior doors generally refer to security doors and fire doors.

Door hinges play an important role in door, making the door open or close easily. When you buy the hinges, maybe you have trouble in installing the door hinge. Now, there has easy way to let you know how to install door hinges.