Halifax or Vancouver our Low priced answert to the heavy weight objects movement, Wheel casters like our VXB20050CPU1B will be rolling your machine or equipment back and forth. Wheel dia. is 50mm or 1.969" inch in inches. Sizes 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, dimensions are 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. Having in mind that every caster wheel has the load capacity of 55 lb with a Swivel type. Ambient temperature range is -40 to 180 F. FYI, you will need to buy the VXB20050CPU1B in order to get one :).