The Middle Atlantic U1V-4 Vented Universal Rack Shelf is a set of 4 black rack shelves designed by Middle Atlantic Products. Each shelf has a rack unit height of 1U, making them compatible with standard rackmount cabinets and frames. These vented shelves provide a sturdy and organized solution for organizing and displaying equipment in server rooms or networking setups. With a reliable brand like Middle Atlantic Products, you can trust in the quality and durability of these rack shelves for your networking needs.