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