These wood/steel mobile shelving units are adaptable floor space savers. Create an open space for programs or storytelling. Units feature a toe kick (1/2" above floor) base to conceal the 4" high, heavy-duty, easy-rolling casters. Plywood backs 1/4" thick are included. For maximum mobility and safety, mobile shelving may be ordered in starter units only. This unit features 2 base and 4 adjustable shelves. It measures 37-1/2"W x 24"D x 52"H. Wt. 174 lbs. Ships by truck.