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