Mounting VXB005100FPF is the economoical solution of building project to move around by pushing or pulling. Dia. Measured of the caster wheel in metric standard 100mm which is equal to 3.937" inch with imperial units. The wheel has a width of 45mm=1.772" inch. The caster dimensions heightwise is 145mm/5.709" inch. Mounted via a Top Plate that has a size of 100mm x 115mm and the holes distance of 75mm x 85mm. Low drag was achieved by a co-polypropylene core on a co-polypropylene tire spinning freely with a Double ball beaing. Maximum load calpacity that could not be exceeded on each wheel, remember to add safety factor, when calculating the load capacity 551 lb with a Fixed type. The Temperature range is -40 to 180 F. FYI, you will need to buy the VXB005100FPF in order to get one :).