Tens of thousands of different kinds to select from to have your office Desk/chair sliding easily right and left, install the VXB005150HPUF. Diameter size of the caster wheel has a metric standard 150mm which is equal to 5.906" inch with imperial units. The wheel has a width of 50mm=1.969" inch. The caster dimensions heightwise is 195mm/7.677" inch. Mounted via a Top Plate that has the size of 100mm x 115mm and the holes distance of 75mm x 85mm. The weehl core material is Polyurethane and has a Polyurethane tire with a low friction Double ball beaing. Bearing in mind that every caster wheel has the load capacity of 617 lb with a Fixed type. Environment temperature range is -40 to 180 F. Very important notice, you need to buy the VXB005150HPUF in order to get one :).