Astrotek 1U Rack Mount Cable Management Plastic Panel The ASTROTEK Cable Management come in 1U (1.75″) rack height. Available with or Plastic D-Ring 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