The RDCM2136BK is an adjustable depth cable manager that ranges from 21-36 Inches. It prevents cables from sagging when running front to rear, and cable pass-through holes are evenly spaced. The RDCM2136BK is finished in smooth black powder paint and constructed in 16-gauge steel. The universal design is compatible with both racks and cabinets and requires two pairs of mounting rails to install, along with mounting hardware.