Door Stopper: This air pressure door closer for out-swinging doors is ideal for heavy-duty storm doors which are 1.25-2 inches thick Adjustable and Easy to Install: Made of aluminum, this door closer easily screws onto the door and can be installed either at the top, in the middle, or at the bottom Versatile Design: This storm door closer has a cylinder tube which is 1.5 inch in diameter and 10.5 inches in length and can be adjusted when screens or glass storm panels are swapped during seasonal changes Smooth Closing: The door closing is adjustable with this pneumatic door closer and can be adjusted with the air screw at the end of the cylinder Includes: Screws and brackets needed for installation