Moves large items quicker using the VXB005150BLPP. The wheel diameter is 150mm or 5.906" inch in inches. Dimensions of the caster wheel is 50mm (1.969" inch). The Caster with the wheel from end to end is 195mm = 7.677" 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. Low drag was achieved by a Polypropylene core on a Polypropylene tire spinning freely with a Double ball beaing. Each caster will carry the load of 617 lb and is Swivel type. The caster temperature range = -40 to 180 F. Very important notice, you need to buy the VXB005150BLPP in order to get one :).