Cotterman® steel rolling ladder is ideal for general warehouse or retail use. 450-lb. load rating. Serrated, open grip tread allows liquids to drain quickly. For oily, wet, or outdoor environments. Provides maximum slip resistance in most environments. 7" deep treads, 10" deep top step. Molded polyurethane with Delrin® bearings. Gray powder-coated finish. Equipped with foot-activated lock step. Ship assembled. Meet OSHA and ANSI standards.Note: A Cal/OSHA compliant unit may be substituted for ship to addresses into the State of California.