Halifax or Vancouver our Low priced answert to the heavy weight objects movement, Wheel casters like our VXB004125PPF will be rolling your machine or equipment back and forth. Wheel dia. is 125mm or 4.921" inch in inches. Sizes of the caster wheel is 30mm (1.181" inch). The height of the wheel caster is 155mm = 6.102" inch. Top Plate is the method of installing the caster to your equipment, dimensions are 93mm x 62mm with the holes distance of 45mm x 72mm. This caster wheel core made of Polypropylene and has a Polypropylene tire spinning over Double ball bearing. Having in mind that every caster wheel has the load capacity of 220 lb with a Rigid type. Ambient temperature range is -40 to 180 F. FYI, you will need to buy the VXB004125PPF in order to get one :).