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Imagine your office chair has no wheel caster, you would be carrying it right and left, install 4inch-Caster-020 instead. This caster is rolled on a wheel that has 100mm diameter/3.937" inch inches. The wheel has a width of 50mm=1.969" inch. The overall height of the caster is 150mm or 5.906" inch. This wheel caster can be mounted using a Top Plate with the dimensions of 115mm x 100mm x 6mm and holes distance of 72mm x 85mm. Low drag was achieved by a Cast Iron and Polyurethane core on a Cast Iron and Polyurethane tire spinning freely with a Roller bearing. Bearing in mind that every caster wheel has the load capacity of 661 lb with a Fixed type. The temperature range is -40 to 180 F. Buy the 4inch-Caster-020 now, just add the quantity to basket and click on Checkout.