4inch-Swivel-Caster-032 is a wheel caster, which is the shortcut of installing wheels on a hospital bed, or any objexct needed to be moved. Diameter of the caster wheel is a metric standard 100mm that is equal to 3.937" inch with imperial units. The wheel has a width of 50mm=1.969" inch. The caster dimensions heightwise is 142mm/5.591" inch. This wheel caster can be mounted using a Top Plate with the dimensions of 100mm x 115mm and holes distance of 75mm x 85mm. The Double ball beaing design will enable the Polyurethane tire to roll easily with a core made of Polyurethane. Bearing in mind that every caster wheel has the load capacity of 441 lb with a Swivel type. Temperature range = -40 to 180 F. Remember, you will have to buy the 4inch-Swivel-Caster-032 in order to have it :).