"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. Caster Type Safe lock, Rail Height in. 30, Step Depth in. 7, Step Type Expanded metal, Steps qty. 6, Top Step Height in. 60, Top Width in. 26, Capacity lbs. 450, Dimensions W x D x H in. 30 x 46 x 90, Base Size W x D in. 30 x 46, OSHA Approved Yes California, Finish Type Gray, Material Type 1 in. O.D. steel tubing, Caster Size in. 4. Handrails"