【Invisible door closer】: load-bearing 40-60KG (88-132lb), thickened rocker arm, thickness up to 5.46MM, strong and wear-resistant! There is a stopper, and the hexagonal screw fixation realizes the conversion between positioning and non-positioning. 【Heavy-duty door control】: Install the door closer on the entrance door to prevent insects from entering. The automatic door closer can manage the door for you, with a hydraulic buffer function to prevent the door from slamming shut and blocking customers. 【Speed ​​adjustment】: Adjust the anti-slamming device to meet your specific needs. Choose from 2 fast to slow settings. No negative difference in opening and closing, hydraulic body square shaft, positive and negative force of the speed regulating valve; square shaft to ensure the stability of the door when in use. 【Two-stage speed regulation】: tighten the screw clockwise to reduce the closing speed point, and tighten the screw counterclockwise to speed up the closing speed point. 【Flexible installation】: equipped with a full set of installation materials to support the connection of the door closer to any common door frame and door frame material. Suitable for punchable wooden doors.