This pneumatic door closer from Ideal Security uses air pressure to provide sure, silent closing. It is designed for light- to medium-weight doors up to 1 1/4-inches thick, 30 lb. to 50 lb.The door closing speed is adjustable, ensuring that doors shut securely every time. Seasonal adjustment options allow you to swap between window and screen on your door. The SK80 includes all necessary brackets and screws for installation, and is easy to install using the existing holes on your door (if this was the model on the door previously). The included SK14 storm door chain prevents from damage if a strong wind catches the door. This is an original equipment quality door closer.