With the levers,you can freely adjust the closing force,which increases the comfort and ease of closing the door. Quiet Noises Reduction Technology The automatic door Closing Device not only reduces force required to close the door and protects the integrity of the door,but also greatly reduces noise. Suitable for most mediums sized door,whether wood door,glass door or metal door that open right or left. The door Closing Device have automatic Rebounds function,which can ensures that the door automatically rebounds after closing,avoiding hazards caused by the door not being fully closed. Make from Aluminum Alloys component,Light weight,strong and resistant,ensuring stability and durability.