Tens of thousands of different kinds to select from to have your office Desk/chair sliding easily right and left, install the VXB004075TPRF. The wheel diameter is 75mm or 2.953" inch in inches. Dimensions of the caster wheel is 30mm (1.181" inch). The Caster with the wheel from end to end is 105mm = 4.134" inch. Mounted via a Top Plate that has the size of 93mm x 62mm and the holes distance of 45mm x 72mm. Low drag was achieved by a Thermoplastic Rubber core on a Thermoplastic Rubber tire spinning freely with a Double ball bearing. Maximum load calpacity that should not be exceeded on each wheel, remember to add safety factor, when calculating the load capacity 176 lb with a Rigid type. Environment temperature range is -40 to 180 F. Very important notice, you need to buy the VXB004075TPRF in order to get one :).