Maximum storage capacity with minimum floor space requirements | Reinforced steel shelves welded in place for added strength and durability | All shelves feature large front lip to keep small items from rolling off | Each bi-fold section is mounted on four casters for easy opening and closing | Six (6) swivel and two (2) rigid 6-inch (152 mm) casters included for easy mobilityGreenlee's bi-fold storage cabinets give you maximum storage capacity with minimum floor space requirements. Four (4) individual 15-inch d. By 14-1/2-inch h. By 60-inch w (381 by 368 by 1524 mm), storage compartments on each side. Reinforced steel shelves welded in place for added strength and durability. All shelves feature large front lip to keep small items from rolling off. Each bi-fold section is mounted on four casters for easy opening and closing. Six (6) swivel and two (2) rigid 6-inch (152 mm) casters included for easy mobility.(models 503 and 603). Recommend no.1 And no.5 Masterlock padlocks or equivalent.