Efficient VXB005200BABLB1 makes it feasible to pull and push items instead of transport Dia. Measured of the caster wheel in metric standard 200mm which is equal to 7.874" inch with imperial units. The wheel has a width of 50mm=1.969" inch. The Caster with the wheel from end to end is 240mm = 9.449" inch. This wheel mounting is Top Plate with the dimensions of 115mm x 100mm x 6mm and holes distance of 72mm x 85mm. Low drag was achieved by a Aluminum core and Rubber core on a Aluminum core and Rubber tire spinning freely with a Double ball beaing. Each caster wheel will carry the load of 661 lb and is Swivel type. The Temperature range is -40 to 180 F. FYI, you will need to buy the VXB005200BABLB1 in order to get one :).