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. Good Ventilation: The 12"deep server rack shelf with many vented holes accelerates the heat dissipation speed and keeps the equipment cool and long-lasting. Durable and Sturdy: Cantilever tray is made of high-quality SPCC cold-rolled steel with powder coated finish for durability and rust resistance, enhancing the cantilever's strength. Max. Weight Capacity: 30 lbs. Warranty: Support no reason return or exchange within 28 days after getting our shelf. Our engineer will provide with the professional guide and help. Your 100% satisfaction is our target.