This Floor Mount Rack is an economy 2-post open frame rack that has the capability to be configured into a 4-post rack with the optional expansion kit (FR1907-45-02LE). These racks are constructed of steel and are built with a tapped hole rail design. They are ideal for mounting of patch panels, hubs, routers, Audio/Video equipment and more. They have a black microfinish with numbered rack units, and come in a 7ft. height.