Fits all 19 racks and cabinets to hold various IT, network, and AV equipment. Vent design maximizes airflow while maintaining structural integrity. 40 pound weight capacity, up to 70% more than other cantilever rack shelves. Heavy-duty 2.4mm thick SPCC cold rolled steel construction. 1U height, 6 deep, includes 10-32 screw, washer, and cage nut set.