"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, Rail Height in. 30, Top Width in. 26, Steps qty. 5, Caster Size in. 4, Step Type Expanded metal, Capacity lbs. 450, Top Step Height in. 50, Material Type 1 in. O.D. steel tubing, Finish Type Gray, 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. Built-in CAL OSHA rail kit"