Vestil VPRDO Cast Aluminum Dollies are lightweight and strong; ideal for moving heaving crates and machinery. These machinery dollies have box-like frames and move on 3½" diameter, 3" wide phenolic rollers. Maximum capacities are 1,500, 3,000, 6,000 and 9,000 LBS, depending on model (see chart below). Please note: these crate dollies do not have swivel wheels, thus are unable to turn corners. In order to turn corners, it is necessary to lift the load and rotate each dolly individually. The Vestil VPRDO Aluminum Dollies have an overall height of 4¼".