Hubbell System One floor box. Non corrosive plastic construction. Economical, easy to install, in floor delivery system for open plan spaces. The Hubbell System One universal cover mounts directly to the floor box riser, eliminating the need for an additional adapter collar. Concrete cover, conduit reducers and conduit hub plugs included. Oversized 1 1/2 inches data conduit hub for increased cable capacity and bend radius. Parallel conduit hubs reduce labor and material cost, facilitating easier wire pull. Fully adjustable. 5 inches inside diameter. 100 cubic inches capacity. Measures 5 37/64 inches length by 8 49/64 inches width.