Little or minimum effort can be possible on your operator by installing VXB005150CRB1 just ask your operator to push and pull, but not carry. Wheel dia. is 150mm or 5.906" inch in inches. 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 a size of 100mm x 115mm and the holes distance of 75mm x 85mm. The Roller bearing design will enable the Rubber tire to roll easily with a core made of Rubber. Maximum load calpacity that could not be exceeded on each wheel, remember to add safety factor, when calculating the load capacity 617 lb with a Side brake type. The Temperature range is -40 to 180 F. FYI, you will need to buy the VXB005150CRB1 in order to get one :).