Heavy weight capability and Durability made the wheel casters like the VXB005150ACPU a must use, get your do it yourself object move around from our Toronto biz. Dia. Measured of the caster wheel in metric standard 150mm which is equal to 5.906" inch with imperial units. The thickness of the wheel is 50mm or 1.969" inch. The caster dimensions heightwise 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 weehl core material is Iron core and Polyurethane and has a Iron core and Polyurethane tire with a low friction Double ball beaing. Having in mind that every caster wheel has the load capacity of 772 lb with a Swivel+Brake+Fixed type. Ambient temperature range is -40 to 180 F. FYI, you will need to buy the VXB005150ACPU in order to get one :).