Efficient VXB009C100BTWFSPU makes it feasible to pull and push items instead of transport Dia. Measured of the caster wheel in metric standard 100mm which is equal to 3.937" inch with imperial units. The thickness of the wheel is 50mm x 2mm or 1.969" inch. The Caster with the wheel from end to end is 180mm = 7.087" inch. Mounted via a Top Plate that has a size of 180mm x 145mm Top Plate: 12mm+housing: 10mm and the holes distance of 140mm x 105mm. The Precision double ball bearing design will enable the Cast iron polyurethane tire to roll easily with a core made of Cast iron polyurethane. Each caster wheel will carry the load of 3307 lb and is Swivel type. Ambient temperature range is -40 to 180 F. FYI, you will need to buy the VXB009C100BTWFSPU in order to get one :).