Shepherd Hardware 4" Medium-Heavy-Duty Polypropylene 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. The polypropylene wheels are lightweight, non-marking, and highly durable, ing excellent resistance to water and chemicals. This caster is built to last with long-wearing materials that resist water and chemical absorption, making it i for various environments. Please note that fasteners are not included with this product. Model Number: 9784