Universality: 1U ventilation rack shelf fits all 19-inch standard racks and cabinets, used to accommodate IT, data network, and stereo equipment. Multiple uses and positions: Disassembled structure allows you to make the lips up or down to save space and meet the different uses. Screws of assembly and M6 Screws & Cage nuts are included. Suitable for studio use, stage equipment rack, and small home network installation.