product features：
It is suitable for places with high appearance requirements. Concealed installation takes up less space. After installation, the body is hidden in the door body or door frame, which has a simple appearance and enhances the aesthetic feeling. Double speed regulating valve can accurately adjust the door closing speed and locking speed. Applicable door thickness: the minimum thickness of steel door is 36mm, and the minimum speed of wooden door is 40mm. There are standard installation and reverse installation. It has perfect buffer and positioning function. The maximum opening angle of the door is 180 °, and the positioning angle range is 80 ° ~ 150 °.
