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 VXB005200BTPRF. Dia. Measured of the caster wheel in metric standard 200mm which is equal to 7.874" inch with imperial units. Sizes of the caster wheel is 50mm (1.969" inch). The caster dimensions heightwise is 240mm/9.449" inch. Mounted via a Top Plate that has a size of 100mm x 115mm and the holes distance of 75mm x 85mm. The Double ball beaing design will enable the Thermoplastic Rubber tire to roll easily with a core made of Thermoplastic Rubber. Maximum load calpacity that could not be exceeded on each wheel, remember to add safety factor, when calculating the load capacity 661 lb with a Fixed type. The caster wheel temperature range = -40 to 180 F. FYI, you will need to buy the VXB005200BTPRF in order to get one :).