Heavy weight capability and Durability made the wheel casters like the VXB005125CPUF a must use, get your do it yourself object move around from our Toronto biz. Wheel dia. is 125mm or 4.921" inch in inches. The wheel has a width of 50mm=1.969" inch. The caster dimensions heightwise is 167mm/6.575" inch. Mounted via a Top Plate that has a size of 100mm x 115mm and the holes distance of 75mm x 85mm. The Double ball beaing design will enable the Iron core and Polyurethane tire to roll easily with a core made of Iron core and Polyurethane. Each caster wheel will carry the load of 661 lb and is Fixed type. The Temperature range is -40 to 180 F. FYI, you will need to buy the VXB005125CPUF in order to get one :).