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Whatever you are building needed to be on wheels, here come the 4inch-Caster-021. This wheel caster has a wheel diameter of 100mm or 3.937" inch in inches. Dimensions of the caster wheel is 50mm (1.969" inch). The Caster with the wheel from end to end is 124mm = 4.882" inch. Top Plate is the method of installing the caster to your equipment, the dimensions are 138mm x 110mm x 10mm with the holes distance of 110mm x 75mm. The caster core is made of Cast iron polyurethane and has a Cast iron polyurethane tire with a low friction Precision double ball bearing. Here come the maximum load that should be applied on every wheel, remember to add safety factor, when calculating the load capacity 772 lb with a Fixed type. Last and not least the temperature range = -40 to 180 F. Buy the 4inch-Caster-021 now, just add the quantity to basket and click on Checkout.