Halifax or Vancouver our Low priced answert to the heavy weight objects movement, Wheel casters like our VXB009125BCPUB 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 50mm (1.969" inch). The Caster with the wheel from end to end is 195mm = 7.677" inch. This wheel mounting is Top Plate with the dimensions of 138mm x 110mm x 10mm and holes distance of 110mm x 75mm. The weehl core material is Cast iron polyurethane and has a Cast iron polyurethane tire with a low friction Precision double ball bearing. Each caster wheel will carry the load of 882 lb and is Swivel and Upper Brake type. The caster wheel temperature range = -40 to 180 F. FYI, you will need to buy the VXB009125BCPUB in order to get one :).