Moves large items quicker using the VXB005125ATPRB1. The wheel diameter is 125mm or 4.921" inch in inches. Dimensions of the caster wheel is 50mm (1.969" inch). The caster dimensions heightwise is 166mm/6.535" 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 Polypropylene core and Thermoplastic Rubber core on a Polypropylene core and Thermoplastic Rubber tire spinning freely with a Double ball beaing. Maximum load calpacity that should not be exceeded on each wheel, remember to add safety factor, when calculating the load capacity 507 lb with a Swivel and Center Brake type. The caster temperature range = -40 to 180 F. Very important notice, you need to buy the VXB005125ATPRB1 in order to get one :).