Product Size: 1U height, 6" (152mm) deep,Compatible with all standard 19 racks and cabinets to hold various IT, network and other equipment. Lip Downside or Upside: Disassembled Shelf allows you to assemble according to your different usage, and Lip can be upside or downside for meeting different functions. Heavy Duty: 1.2mm Thick holding sides assure strength and Max loading weight capacity can reach 44 pounds, more than other cantilever rack shelves. Slotted Venting Design: Slotted venting design for maximum airflow. Less Freight: 2 Pcs as a set Making the freight less for customers. Including: 4 x M6 screws & cage nuts, 4 x M5 screws & nuts;