The Ergotron 31-039-182 wall track (42-inch) is a low-cost, zero-footprint mounting system that attaches to most vertical surfaces. It accommodates an entire computer workstation. It acts as a common interface for Wall Mount Arms and CPU Holders. The wall track strengthens installation by distributing weight over a larger surface area. It includes channel covers that conceal and route cables. Brackets are required to attach components to Wall Track (order separately). The height of components can be adjusted by loosening set-screws on these brackets.