Heavy weight capability and Durability made the wheel casters like the VXB20050CPUT1B a must use, get your do it yourself object move around from our Toronto biz. 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. 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. Buy the VXB20050CPUT1B now, we ship on the same day.