Imagine your office chair has no wheel caster, you would be carrying it right and left, install 65mm-Caster-002 instead. Diameter of the caster wheel is a metric standard 65mm that is equal to 2.559" inch with imperial units. The wheel has a width of 38.5mm=1.516" inch. The caster dimensions heightwise is 81mm/3.189" inch. Top Plate is the method of installing the caster to your equipment, the dimensions are 92mm x 65mm with the holes distance of 73mm x 45mm. The Ball bearing design will enable the Nylon tire to roll easily with a core made of Nylon. Here come the maximum load that should be applied on every wheel, remember to add safety factor, when calculating the load capacity 331 lb with a Fixed type. The temperature range is -40 to 180 F. Remember, you will have to buy the 65mm-Caster-002 in order to have it :).