Little or minimum effort can be possible on your operator by installing VXB005200BABL just ask your operator to push and pull, but not carry. Wheel dia. is 200mm or 7.874" inch in inches. The wheel has a width of 50mm=1.969" inch. The caster dimensions heightwise is 240mm/9.449" inch. Mounted via a Top Plate that has a size of 115mm x 100mm x 6mm and the holes distance of 72mm x 85mm. The weehl core material is Aluminum core and Rubber and has a Aluminum core and Rubber tire with a low friction Double ball beaing. Having in mind that every caster wheel has the load capacity of 661 lb with a Swivel type. Ambient temperature range is -40 to 180 F. FYI, you will need to buy the VXB005200BABL in order to get one :).