Astrotek 1U Rack Mount Cable Management Metal Panel The ASTROTEK Cable Management come in 1U (1.75') rack height. Available with metal D-Rings with a black powder coat finish for durability to manage your cabling & provide a neat and clean appearance in your network closet. • Designed to fit all standard 19 IN racks and cabinets • Comes in 1U (1.75') Rack Heights, 5 Rings • Provides flexibility for cable management with a neat and clean appearance