Heavy weight capability and Durability made the wheel casters like the VXB012125PF 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. Sizes of the caster wheel is 50mm (1.969" inch). The Caster with the wheel from end to end is 165mm = 6.496" inch. Top Plate is the method of installing the caster to your equipment, dimensions are 160mm x 114mm with the holes distance of 129mm x 74mm. This caster wheel core made of Phenolic and 0-180ºC and has a Phenolic and 0-180ºC tire spinning over Roller bearing. Having in mind that every caster wheel has the load capacity of 661 lb with a Swivel type. The Temperature range is -40 to 180 F. FYI, you will need to buy the VXB012125PF in order to get one :).