"Cotterman rolling ladder features large casters and Safe-Lock security. Steps and platforms are made of slip-resistant, expanded metal. Durable gray enamel finish. Constructed with 1in. O.D. steel tubing to meet or exceed all OSHA and ANSI standards. U.S.A. This unit includes CAL OSHA rail kit required for California orders. Step Type Expanded metal, Capacity lbs. 450, Caster Size in. 4, Step Depth in. 7, Base Size W x D in. 30 x 40, OSHA Approved Yes California, Caster Type Safe lock, Dimensions W x D x H in. 30 x 40 x 80, Steps qty. 5, Top Step Height in. 50, Material Type 1 in. O.D. steel tubing, Finish Type Gray, Rail Height in. 30, Top Width in. 26. Built-in CAL OSHA rail kit"