Low cost solution to the heavy weight objects movement, Wheel casters like our VXB20050CPU1B are used to roll your machine or equipment back and forth. The wheel diameter is 50mm or 1.969" inch in inches. Dimensions of the caster wheel is 50mm (1.969" inch). The Caster with the wheel from end to end is 48mm = 1.890" inch. Top Plate is the method of installing the caster to your equipment, here are the dimensions 38mm x 38mm with the holes distance of 129mm x 74mm. The Roller bearing design will enable the Nylon and Polyvinyl Chloride tire to roll easily with a core made of Nylon and Polyvinyl Chloride. Bearing in mind that every caster wheel has the load capacity of 55 lb with a Swivel type. Environment temperature range is -40 to 180 F. Very important notice, you need to buy the VXB20050CPU1B in order to get one :).