These heavy-duty casters are made of mixed steel and cast iron hub, with a galvanized steel wheel and zinc plated finished yoke. With a load capacity of up to 800 pounds and a 360-degree smooth rotation, they are suitable for indoor and outdoor use. The casters also have a strong roller bearing and steel spanner bushing, and a humanized size brake design for flexible and quiet operation on any floor condition. They can be used for various applications such as pallet jacks, handling trucks, and mobile storage carts.