Halifax or Vancouver our Low priced answert to the heavy weight objects movement, Wheel casters like our VXB005200BLTPR will be rolling your machine or equipment back and forth. Wheel dia. is 200mm or 7.874" inch in inches. The wheel has a width of 50mm=1.969" inch. The Caster with the wheel from end to end is 240mm = 9.449" 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 Thermoplastic Rubber and has a Thermoplastic Rubber tire with a low friction Double ball beaing. Maximum load calpacity that could not be exceeded on each wheel, remember to add safety factor, when calculating the load capacity 661 lb with a Swivel type. The caster wheel temperature range = -40 to 180 F. FYI, you will need to buy the VXB005200BLTPR in order to get one :).