Fast Rack works best for connecting multiple units as pictured or as a single standalone unit. Fast Rack is unique because it does not require a shelf at the bottom of the unit, allowing items to be placed directly on the floor. It is also quick and easy to assemble. Fast Rack requires no nuts, bolts or shelf clips. It is fully adjustable and very heavy duty. Save time and money with this heavy-duty bulk storage shelving. Absolutely no tools are required. The beams lock securely into uprights. Ideal for storing bulky and or heavy items. You have the choice between wire mesh decking or particle board decking for shelf surfaces.