Shepherd 6 In. Polypropylene Medium-Heavy Duty Rigid Caster is a durable and reliable caster designed for industrial use. This rigid caster features polypropylene wheels that provide smooth and easy mobility for heavy loads on hard, smooth surfaces. The wheels are nonmarking, lightweight, and built with high-impact strength, making them resistant to water and chemical absorption. Its versatile design makes it for a wide range of medium-heavy duty applications, including platform trucks, wire shelving, warehouse trucks, and carts. Please note that fasteners are not included with this caster. Model Number: 400 Series