Tens of thousands of different kinds to select from to have your office Desk/chair sliding easily right and left, install the VXB011200SSPUB1. Diameter size of the caster wheel has a metric standard 200mm which is equal to 7.874" inch with imperial units. Dimensions 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 the size of 100mm x 115mm and the holes distance of 75mm x 85mm. The Double ball beaing design will enable the Stainless steel fork and Polyurethane tire to roll easily with a core made of Stainless steel fork and Polyurethane. Maximum load calpacity that should not be exceeded on each wheel, remember to add safety factor, when calculating the load capacity 661 lb with a Swivel type. The caster temperature range = -40 to 180 F. Very important notice, you need to buy the VXB011200SSPUB1 in order to get one :).