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