A rack unit (abbreviated U or RU) is a unit of measure defined as 1+3⁄4 inches (44.45 mm). It is most frequently used as a measurement of the overall height of, as well as the height of equipment that mounts in these frames, whereby the height of the frame or equipment is expressed as multiples of rack units. For example, a typical full-size rack cage is 42U high, while equipment is typically 1.
It is a 1U horizontal cable organizer designed to help eliminate cable stress and maintain a neat, organized cable layout within an enclosure or a rack. It includes an installation guide and mounting hardware. 1U 19" Cable Management Organizer - D Ring Hook Network/Server Rack Cord Manager - Data Center Horizontal Wire Panel with Passthrough Holes w/Mounting HW - EIA/ECA-310-EThe rack-cable management panel makes it easier to organize cables from the front or back of your server rack.