Four-Post Knockdown Distribution Rack, 19" Mounting, 3" Channel tapped 12-24 front and rear Adjustable Depth Rails 28"D - 36"D with a 40"D - 48"D Footprint with Angle Base. Belden offers a complete line of open racks and rack accessories, from single-rack applications (retail, telecom closets) to high-density, multi-rack patching and switching fields (computer room, data centers, central offices). Belden's unique cable and connectivity expertise was central in the design of a feature-rich racking system that offers ease of installation, easy MACs and high levels of scalability.