4-post open-frame racks with depth adjustable between 17.7- and 29.5 in. in 0.98-in increments. Includes four nonlocking casters. Will also accept standard levelers. Order catalog number PMBLM12 separately. The rack mounts on the base to provide greater stability with mobility. Made of steel with RAL 9005 black polyester powder paint finish. Mounting hardware included.