The Planner Studio Second Surface shelves are shipped ready to attach to the Planner Studio Fixed Height Tables. The second shelf work surface consists of a 45 lb. density particle board core with a high pressure laminated surface. The edge of the work surface features a 3 mm flat self edge. Bot the work surface and the edge are finished in "North Sea" Grey. The space between the bottom of the table and the second surface measures 5". The second surface shelf mounts easily to the matching Planner Studio table frame with a set of mounting rails. The rails mount securely to each predetermined location on the Planner Studio leg set. This second surface kit will work with Planner Studio Fixed Height Tables that are 72" Wide and either 36" or 42" Deep.