Halifax or Vancouver our Low priced answert to the heavy weight objects movement, Wheel casters like our VXB20050NYGB 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 height of the wheel caster is 48mm = 1.890" inch. This wheel mounting is with the dimensions of 34mm x 34mm and holes distance of 129mm x 74mm. The Roller bearing design will enable the Nylon tire to roll easily with a core made of Nylon. Each caster wheel will carry the load of 66 lb and is Swivel and Upper Brake type. The Temperature range is -40 to 180 F. FYI, you will need to buy the VXB20050NYGB in order to get one :).