Light Duty Cast Aluminum Dolly. These Propel Dollies are easy to use and provide efficient moving time. Aluminum, box-like frames have integral sides and deeply fluted tops. Dollies include 3½" dia. x 3" wide phenolic rollers. They are excellent for moving heavy crates and machinery. Note: Except when used individually, corners should be turned by lifting the load and rotating each dolly individually. Specs: deck size 4.5" x 4.5"; capacity 1,500 lbs; number of rollers - 1.