Minimization of possible untoward effects on operator by installing VXB011100SSPUB1 just ask your operator to push and pull, but not carry. The wheel diameter is 100mm or 3.937" inch in inches. The wheel has a width of 50mm=1.969" inch. The Caster with the wheel from end to end is 142mm = 5.591" inch. Mounted via a Top Plate that has the size of 100mm x 115mm and the holes distance of 75mm x 85mm. Low drag was achieved by a Stainless steel fork and Polyurethane core on a Stainless steel fork and Polyurethane tire spinning freely with a Double ball beaing. Each caster will carry the load of 441 lb and is Swivel type. Temperature range is -40 to 180 F. Very important notice, you need to buy the VXB011100SSPUB1 in order to get one :).