The product is a lot of network rack brackets from Middle Atlantic Products. Each bracket has a 12U rack unit width and a 3U rack unit height, making them suitable for mounting servers and networking equipment. These freestanding brackets come in a quantity of 12, providing a sturdy and stable support structure for organizing and managing network equipment in a server room or data center. Perfect for professional networking setups, these rack brackets offer a reliable and adjustable solution for mounting and organizing equipment.