"The model 660 scaffold is designed to be erected and adjusted without tools by just one person! Moves on four 5in. brake casters that conform to OSHA standards. Comprised of 5 components: 2 end-frame access ladders, 2 adjustable platform-support trusses, and 1 platform. Fully assembled unit easily rolls through 30in. wide x 80in. high doorway. Positive locking system in the end frame and platform height adjustments in 4in. increments (from just inches off the floor to a maximum of 6 feet) make this scaffold ideal for stairway applications. Overall height including casters is 78in.; length is 74in. and width is 29 1/2in. 1000-lb. capacity. Two additional scaffolds can be stacked for a maximum height of 18 feet (NOTE: Max. load capacity decreases to 700 lbs. with 3 sections). Truck ship. U.S.A."