Mayline Mobilizers File with Lid Mobilizer, The Mobilizers Letter Size (File with lid) has a heavy-gauge steel construction with 4 non-locking casters and a drawer lock It fits under most desks It features a drawer lock and a drawer pull is included All models are UPS-able, ready-to-assemble, and are available on both the Kwik-Ship and Fast Freight delivery programs with no quantity limitations