Imagine your office chair has no wheel caster, you would be carrying it right and left, install 6inch-Swivel-Caster-014 instead. Diameter of the caster wheel is a metric standard 150mm that is equal to 5.906" inch with imperial units. Dimensions of the caster wheel is 50mm (1.969" inch). The Caster with the wheel from end to end is 195mm = 7.677" inch. Mounted via a Top Plate that has the size of 100mm x 115mm and the holes distance of 75mm x 85mm. Rolling with a wheel core material of Polyurethane and a Polyurethane tire rolled over Double ball beaing. Each caster will carry the load of 617 lb and is Swivel type. Last and not least the temperature range = -40 to 180 F. Remember, you will have to buy the 6inch-Swivel-Caster-014 in order to have it :).