Heavy weight capability and Durability made the wheel casters like the VXB005125CPU a must use, get your do it yourself object move around from our Toronto biz. Dia. Measured of the caster wheel in metric standard 125mm which is equal to 4.921" inch with imperial units. The thickness of the wheel is 50mm or 1.969" inch. The caster dimensions heightwise is 167mm/6.575" inch. Top Plate is the method of installing the caster to your equipment, dimensions are 100mm x 115mm with the holes distance of 75mm x 85mm. The Double ball beaing design will enable the Iron core and Polyurethane tire to roll easily with a core made of Iron core and Polyurethane. Maximum load calpacity that could not be exceeded on each wheel, remember to add safety factor, when calculating the load capacity 661 lb with a Swivel type. The caster wheel temperature range = -40 to 180 F. FYI, you will need to buy the VXB005125CPU in order to get one :).