Thousands of different kinds using our Canada based business to select from to have your office Desk/chair sliding easily right and left, install the VXB005C200BAPUB2. 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 height of the wheel caster is 250mm = 9.843" 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 Aluminium and Polyurethane core on a Aluminium and Polyurethane tire spinning freely with a Double ball beaing. Having in mind that every caster wheel has the load capacity of 1543 lb with a Swivel and Upper Brake type. Ambient temperature range is -40 to 180 F. FYI, you will need to buy the VXB005C200BAPUB2 in order to get one :).