MATERIAL -- Aluminum alloy tube body and galvanized iron shaft storm door closures, powder coating finish, screen door piston door closer very durable and will not rust WITH BUFFER -- Adjust the screw at the end of the black screen door pneumatic closer to change the door closing buffer speed PRODUCT DESIGN -- Dluno door closers for home size: 13in x 1.26in (length x diameter)Designed for light weight storm doors, for wood or metal out swinging doors EASY TO USE -- Install with packaging screws, move the metal positioning card on the storm door pneumatic closer sliding shaft, adjust the angle of the door, fully open 90 degrees PRODUCT USE -- This front door pneumatic spring door closer, designed for light duty doors, suitable for storm doors and screen doors Dluno 2-Pack screen door closer