Shepherd 2-1/2 In. Polypropylene General Duty Swivel Plate Caster features a black polypropylene wheel with a ball bearing swivel and plate mount, designed for easy mobility of heavy loads on smooth, hard surfaces. These polypropylene wheels are lightweight, non-marking, and highly durable, ing excellent resistance to water and chemicals. Their high-impact construction ensures long-lasting performance, making them i for various general-duty applications. Please note that fasteners are not included.