FeaturesFrame is a strong and lightweight aluminum (6063-T6 alloy), extruded or formed, with RU markings on both front and back of uprights2-post open frame racks satisfy basic functional requirements for structuring cableRange of heights from 4 to 9 ft (24U to 58U) to match capacity requirements; 19-in rack packages are 7 ft highSide rails are tapped on both sides with 12-24 UNC threads for quick installationEIA Universal 5/8 in, - 5/8 in, - 1/2 in vertical mounting hole pattern matches industry standardsRU markings on both front and back of uprights make it easier to mount equipmentPacked unassembled in individual cartons, assembly hardware (including twenty 12-24 mounting screws) is furnished for convenient storage and installationConvenient rack and cable manager packages offered with either one or (2) 6 in cable managers