Minimization of possible untoward effects on operator by installing VXB005150BTPR just ask your operator to push and pull, but not carry. And rolling on wheel that has 150mm diameter/5.906" inch. The wheel has a width of 50mm=1.969" inch. The caster dimensions heightwise is 195mm/7.677" inch. Mounted via a Top Plate that has the size of 100mm x 115mm and the holes distance of 75mm x 85mm. The Double ball beaing design will enable the Thermoplastic Rubber tire to roll easily with a core made of Thermoplastic Rubber. Each caster will carry the load of 617 lb and is Swivel type. Environment temperature range is -40 to 180 F. Buy our VXB005150BTPR, we wish all the best.