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Imagine your office chair has no wheel caster, you would be carrying it right and left, install 4inch-Caster-012 instead. Diameter of the caster wheel is a metric standard 100mm that is equal to 3.937" inch with imperial units. Dimensions of the caster wheel is 40mm (1.575" inch). The Caster with the wheel from end to end is 140mm = 5.512" inch. Mounted via a Top Plate that has the size of 110mm x 100mm x 4mm fork:3.5mm and the holes distance of 85mm x 75mm. The ball bearing design will enable the Polyurethane and Polypropylene tire to roll easily with a core made of Polyurethane and Polypropylene. Here come the maximum load that should be applied on every wheel, remember to add safety factor, when calculating the load capacity 551 lb with a Fixed type. The temperature range is -40 to 180 F. Buy the 4inch-Caster-012 now, just add the quantity to basket and click on Checkout.