"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. This unit includes CAL OSHA rail kit required for California orders. Rail Height in. 30, Caster Type Safe lock, Dimensions W x D x H in. 30 x 53 x 100, Steps qty. 7, Top Step Height in. 70, Top Width in. 26, Base Size W x D in. 30 x 53, Capacity lbs. 450, Caster Size in. 4, Material Type 1 in. O.D. steel tubing, Step Depth in. 7, Step Type Expanded metal, Finish Type Gray, OSHA Approved Yes California. Built-in CAL OSHA rail kit"