Adjustable Screw Choose your rewind speed according to the environment the closer is located by adjusting the socket head cap screw on top. Aluminum Alloy Material door closer is made of high quality aluminum alloy, chrome-plated, rustproof and durable, spring operated, fully automatic closing, simple and safe protection for door and lock. Reduce the Closing Strength The automatic door closer reduces the strength when closing the door. Closes fully automatically and can be speed controlled and offers you a safe door closing mechanism. Quick and Easy-Installation It has simple assembly and attachment with provided screws and tools for hassle-free installation. Suitable for residential and commercial purposes. Protect Your Doors and Property It prevents damage from slamming doors, reduce noise interference, and keep property secure. Converts hinged doors into self-closing doors. Premium Material