You need 5inch-Caster-020 to have your office desk, equipment or even a machine to easily roll them around. 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 overall height of the caster is 166mm or 6.535" 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 Thermoplastic Rubber tire to roll easily with a core made of Thermoplastic Rubber. Bearing in mind that every caster wheel has the load capacity of 507 lb with a Fixed type. Temperature range = -40 to 180 F. Remember, you will have to buy the 5inch-Caster-020 in order to have it :).