Tens of thousands of different kinds to select from to have your office Desk/chair sliding easily right and left, install the VXB005200PVCB1. The wheel diameter is 200mm or 7.874" inch in inches. The thickness of the wheel is 50mm or 1.969" inch. Overall height of the wheel caster is 240mm = 9.449" inch. This wheel caster can be mounted using a Top Plate with the dimensions of 100mm x 115mm and holes distance of 75mm x 85mm. Low drag was achieved by a Polyvinyl Chloride core on a Polyvinyl Chloride tire spinning freely with a Double ball beaing. Bearing in mind that every caster wheel has the load capacity of 661 lb with a Swivel type. Environment temperature range is -40 to 180 F. Very important notice, you need to buy the VXB005200PVCB1 in order to get one :).