This standard-duty pneumatic door closer uses air pressure to provide sure, silent closing. Ideal for doors up to 1-1/4" thick, 30 to 50 lbs. The door closer's cylinder measures 1.25 inches in diameter and it has an overall length of 13". The door closing speed is adjustable, ensuring that doors shut securely every time. The seasonal adjustment options allow you to swap between window and screen on your door. The Touch-N-Hold function allows you to keep the door open by pressing only a button, the mechanism disengages once the door is pushed.