Imagine your office chair has no wheel caster, you would be carrying it right and left, install 5inch-Swivel-Caster-025 instead. Diameter of the caster wheel is a metric standard 125mm that is equal to 4.921" inch with imperial units. The thickness of the wheel is 50mm or 1.969" inch. The caster dimensions heightwise is 166mm/6.535" inch. Mounted via a Top Plate that has the size of 100mm x 115mm and the holes distance of 75mm x 85mm. Low drag was achieved by a Thermoplastic Rubber core on a Thermoplastic Rubber tire spinning freely with a Double ball beaing. Each caster will carry the load of 507 lb and is Swivel type. Last and not least the temperature range = -40 to 180 F. Remember, you will have to buy the 5inch-Swivel-Caster-025 in order to have it :).