Heavy weight capability and Durability made the wheel casters like the VXB005150C a must use, get your do it yourself object move around from our Toronto biz. Wheel dia. is 150mm or 5.906" inch in inches. The thickness of the wheel is 50mm or 1.969" inch. The Caster with the wheel from end to end is 193mm = 7.598" 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 Roller bearing design will enable the Cast iron tire to roll easily with a core made of Cast iron. Having in mind that every caster wheel has the load capacity of 617 lb with a Swivel type. The Temperature range is -40 to 180 F. FYI, you will need to buy the VXB005150C in order to get one :).