Minimization of possible untoward effects on operator by installing VXB005125APVC just ask your operator to push and pull, but not carry. The wheel diameter is 125mm or 4.921" inch in inches. The wheel has a width of 50mm=1.969" inch. The caster dimensions heightwise is 167mm/6.575" inch. Top Plate is the method of installing the caster to your equipment, here are the dimensions 100mm x 115mm with the holes distance of 75mm x 85mm. Low drag was achieved by a Polyurethane core on a Polyurethane tire spinning freely with a Double ball beaing. Each caster will carry the load of 507 lb and is Swivel type. The caster temperature range = -40 to 180 F. Very important notice, you need to buy the VXB005125APVC in order to get one :).