Listing is for a set of four (4) Service Caster Series #30 swivel casters with 4" diameter by 2" wide dual polyurethane on aluminum wheels and maintenance free precision ball wheel bearings capable of supporting a total weight of 5,000 lbs. (1,250 lbs. per caster). When searching for a reliable and durable solution to your caster needs, rely on Service Caster Series 30 dual wheel polyurethane aluminum casters. The Series #30 features heavy duty polyurethane wheels that are chemically bonded to an aluminum core, providing a smooth roll over uneven surfaces without marking or marring floors. Finely crafted with a bright zinc plated finish and heat-treated ball bearing raceway, these versatile casters are ideal for a wide range of applications. Use on dollies, platform trucks, warehouse carts and freight terminals, or ensure a smooth and secure ride for food service carts, hotel housekeeping carts, and industrial and commercial equipment. Even drywall carts, welding carts, and wall panel carts will be ready to roll on the Series 30, keeping you moving forward. Service Caster is unsurpassed in quality, reliability, and excellent customer service. Count on us to move you forward.