Heavy weight capability and Durability made the wheel casters like the VXB005200BC a must use, get your do it yourself object move around from our Toronto biz. Wheel dia. is 200mm or 7.874" inch in inches. Sizes of the caster wheel is 50mm (1.969" inch). The caster dimensions heightwise is 240mm/9.449" inch. Mounted via a Top Plate that has a size of 100mm x 115mm and the holes distance of 75mm x 85mm. Low drag was achieved by a Black Cast iron core on a Black Cast iron tire spinning freely with a Roller bearing. Having in mind that every caster wheel has the load capacity of 661 lb with a Swivel type. The caster wheel temperature range = -40 to 180 F. FYI, you will need to buy the VXB005200BC in order to get one :).