Tens of thousands of different kinds to select from to have your office Desk/chair sliding easily right and left, install the VXB009A075PAF. Diameter size of the caster wheel has a metric standard 75mm which is equal to 2.953" inch with imperial units. The thickness of the wheel is 49mm or 1.929" inch. The Caster with the wheel from end to end is 101mm = 3.976" inch. Mounted via a Top Plate that has the size of 92mm x 65mm and the holes distance of 73mm x 45mm. Low drag was achieved by a Nylon core on a Nylon tire spinning freely with a Ball bearing. Bearing in mind that every caster wheel has the load capacity of 441 lb with a Fixed type. The caster temperature range = -40 to 180 F. Very important notice, you need to buy the VXB009A075PAF in order to get one :).