UNIVERSAL: 1 u 16" depth network rack mount shelves work 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)* 15.7 (depth)*1.78 (height). Comes with 2 pieces of 16 " depth server rack shelves, mounting screws & cage nuts in one packing box. EASY TO INSTALL: Comes with 2 pieces of 16 " depth server rack shelves, mounting screws & cage nuts in one packing box.Easy to install within a few minutes.