Imagine your office chair has no wheel caster, you would be carrying it right and left, install 6inch-Lock-Swivel-Caster-003 instead. Diameter of the caster wheel is a metric standard 150mm that is equal to 5.906" inch with imperial units. The wheel has a width of 50mm=1.969" inch. The Caster with the wheel from end to end is 200mm = 7.874" inch. Mounted via a Top Plate that has the size of 115mm x 100mm x 6mm and the holes distance of 72mm x 85mm. Rolling with a wheel core material of Aluminium and Polyurethane and a Aluminium and Polyurethane tire rolled over Double ball beaing. Each caster will carry the load of 1102 lb and is Swivel and Upper Locking type. Last and not least the temperature range = -40 to 180 F. Buy the 6inch-Lock-Swivel-Caster-003 now, just add the quantity to basket and click on Checkout.