The Quick Set Shelf for R8, R10, R11G, and R12 Carts from MultiCart is designed to install quickly between both cart handles, converting the cart into a mobile workstation. As a result, this mobile workstation is used in sound or video production, as well as in photo applications in the studio or on location. The installed shelf, which is adjustable between 32 and 50" in length, is supported by steel tubes.