UNIVERSAL: RIVECO rack mount shelf works great for all 19 standard racks and cabinets, shelving for IT, data network & stereo equipment MAXIMUM AIRFLOW: Vented design speeds up the heat dissipation, keeping the equipment cool & prolonged STURDY & DURABLE: This classic cantilever tray features high quality SPCC cold rolled steel, 2.0 mm thickness, ideal for server and normal network devices with width less than 19 DIMENSION: 19 (width)* 9.8 (depth)*1.78 (height) EASY TO INSTALL: Comes with 2 pieces of server rack shelves, mounting screws & cage nuts in one packing box. Easy to install within a few minutes