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