Halifax or Vancouver our Low priced answert to the heavy weight objects movement, Wheel casters like our VXB005150ACPUF will be rolling your machine or equipment back and forth. Dia. Measured of the caster wheel in metric standard 150mm which is equal to 5.906" inch with imperial units. The thickness of the wheel is 50mm or 1.969" inch. The height of the wheel caster is 193mm = 7.598" inch. Top Plate is the method of installing the caster to your equipment, dimensions are 100mm x 115mm with the holes distance of 75mm x 85mm. Low drag was achieved by a Iron core and Polyurethane core on a Iron core and Polyurethane tire spinning freely with a Double ball beaing. Each caster wheel will carry the load of 772 lb and is Fixed type. The caster wheel temperature range = -40 to 180 F. FYI, you will need to buy the VXB005150ACPUF in order to get one :).