Halifax or Vancouver our Low priced answert to the heavy weight objects movement, Wheel casters like our VXB011125SSPUF will be rolling your machine or equipment back and forth. Dia. Measured of the caster wheel in metric standard 125mm which is equal to 4.921" inch with imperial units. The wheel has a width of 50mm=1.969" inch. The Caster with the wheel from end to end is 166mm = 6.535" inch. This wheel mounting is Top Plate with the dimensions of 100mm x 115mm and holes distance of 75mm x 85mm. The weehl core material is Stainless steel fork and Polyurethane and has a Stainless steel fork and Polyurethane 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 507 lb with a Fixed type. Ambient temperature range is -40 to 180 F. FYI, you will need to buy the VXB011125SSPUF in order to get one :).