Who said Canada do not sell caster wheel, eh? The VXB20050CPUT3B can move your large heavy object. Wheel dia. is 50mm or 1.969" inch in inches. Sizes of the caster wheel is 50mm (1.969" inch). The caster dimensions heightwise is 48mm/1.890" inch. Mounted via a that has a size of 38mm x 38mm and the holes distance of 129mm x 74mm. Low drag was achieved by a Nylon and Polyvinyl Chloride core on a Nylon and Polyvinyl Chloride tire spinning freely with a Roller bearing. Maximum load calpacity that could not be exceeded on each wheel, remember to add safety factor, when calculating the load capacity 55 lb with a Swivel and Upper Brake type. The caster wheel temperature range = -40 to 180 F. FYI, you will need to buy the VXB20050CPUT3B in order to get one :).