Open frame rack 2-post are designed for use in communication data centers and telecommunication rooms. Range of heights from 4 feet to 9 feet (24U to 58U) to match capacity requirement is 19 inch rack packages are 7 feet high. Side rails are tapped on both sides with 12-24UNC threads for quick installation. RU markings on both front and back of uprights make it easier to mount equipment. Convenient rack and cable manager packages offered with either one or two 6 inch cable managers, includes one-piece hinged cover. Frame is a strong and lightweight aluminium (6063-T6 alloy), extruded or formed, with RU markings on both front and back of uprights. RAL 9005 black polyester powder paint or milled aluminium.