Our heavy-duty caster set includes four 4 in. heavy-duty casters, each capable of easily bearing a weight of 600 lbs. With a double-bearing design, they ensure stability and durability. The tire material is polyurethane, ensuring silent movement without leaving any marks, thus protecting the floor. Each caster is equipped with two high-quality bearings, making them wear-resistant and durable with a strong load capacity. These 4 in. casters are particularly quiet when used indoors, gentle on floors, and offer flexible movement suitable for various occasions. For customer convenience, we package four casters together and provide iron washers and screws. Whether it's a workbench, cart or furniture, our heavy-duty casters can handle it all, becoming your mobility expert.