Features: 1) Material: aluminum or die-cast aluminum 2) Functions: closing and latching door 3) Stainless steel piece cover is graceful in appearance 4) Installation: vertical, parallel, slide rail Note: Models 1122 and 1123 feature profiled aluminium housings and are furnished with installation boards. When installing these products, the installation board must first be mounted on the door or door frame, with the door closer then mounted on this board.