This kind of door hinge is used for the door which has frame fan different plane, such as plastic steel door and wood door. There are difference from traditional zinc alloy door: 1. All the adjustable point at the metal. 2. Appearance is smooth, it is not easy to stain., beautiful and convenient for clean. 3. It is convenient to load and unload for shuck under door fan opened, also fit for install and adjust. At the same time, when close the door fan, take off shuck can be guard against burglary. 4. Itis adjustable in two axis (. Shaft can be adjustable go up and down).