This size 3 door closer from Taymor is made of steel and has a high-strength pressure-cast aluminum housing. Its two separate speed regulating valves control its closing and latching speed, and its narrow design will seamlessly integrate your doorframe. It's perfect for wood, metal, glass and fire exit doors. Use with doors weighing from 88 lb to 144 lb. UL and ULC approved. This product is backed by a 5-year limited warranty.