"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 Depth in. 7, Step Type Expanded metal, Capacity lbs. 450, Caster Size in. 4, Top Step Height in. 50, Top Width in. 26, Rail Height in. 30, Steps qty. 5, Caster Type Safe lock, Dimensions W x D x H in. 30 x 40 x 80, Base Size W x D in. 30 x 40, OSHA Approved Yes California, Material Type 1 in. O.D. steel tubing, Finish Type Gray. Built-in CAL OSHA rail kit"