"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 Step Height in. 70, Caster Size in. 4, Material Type 1 in. O.D. steel tubing, Top Width in. 26, Step Depth in. 7, Steps qty. 7, Capacity lbs. 450, Caster Type Safe lock, Step Type Expanded metal, Rail Height in. 30, OSHA Approved Yes California, 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"