Overhead rack to support additional rack space above existing racks or cabinets. Easily installs to wire cable tray, tubular runway, or threaded rod. The racks are fully assembled and bonded as packaged. The racks are available in 2RU thru 8RU, in black or white to match any installation. Includes a 3 piece waterfall to elegantly route cables down to the lower racks. Used when floor space is at a premium or for easy top of rack cable patching.