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The Polyurethane Swivel Caster, 308-550 Lb Capacity, 6 In Diameter x 1-3/4 In Wide is engineered for spring-loading and towing, featuring a yellow high-performance polyurethane tread that resists abrasion and excels over long distances. Its advanced radial bearing ensures smooth, effortless rolling, while built-in springs cushion sensitive loads for superior impact absorption. Kingpinless for durability, this moisture-resistant caster offers high capacity and reliable performance in demanding towing applications.