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