The Roberts Heavy-Duty Cargo Dollies are constructed of industrial-strength steel that is bolted and welded together, capable of holding up to 1000 pounds (453.6kg) each. Great for easily moving rolls of carpet, sheeting, furniture, appliances and equipment. Use the spring-loaded lock pin to adjust the dollies from 24" to 33" (61 to 84cm) in length. Non-mar, 3" (7.6cm) polyurethane wheels provide easy movement without damaging floors.