The Samson Universal Rack Stand SRK21 is a rugged, steel universal rack stand featuring fully enclosed side panels. It stands on (4) heavy-duty, 7.5 cm casters with locking fronts, making movement of the cabinet a breeze. It was designed for 48 cm equipment and offers 21U of space. Included with the rack is a single-space, flanged blank panel. Its unique steel support-bar construction also allows this rack to be used with either European or U.S. thread sizes.