The Locking Mobile Tub File with Drawer is a durable steel constructed office cart that accommodates letter- and legal-size hanging folders. The file cart is built with a tub file on top and full suspension bottom file drawer. Both the lid and file drawer lock (four keys included). The mobile cart rests on four wheels (two locking). Ships fully assembled except for wheels. Letter Size. Material(s): Steel; Overall Material Type: Metal; Color(s): Black; Color Family: Black.