New HD-2U-SP splicing fiber shelf. theCommScope Systimax Solutions 760231514C HD-2U-SP is a 2 unit height spice modular cassette shelf designed for rack-mounted cabinets. With a rack unit width of 19 inches, this product provides a convenient and organized solution for organizing and storing networking equipment such as routers, switches, and servers. Its sturdy construction and modular design make it easy to customize and expand the storage capacity of your rack-mounted cabinets to suit your specific networking needs.