Cotterman® steel rolling ladder is ideal for general warehouse or retail use. 450-lb. load rating. Expanded metal, open tread step design prevents debris buildup in all applications. 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.