Listing is for one (1) Service Caster 6" diameter by 3" tread width Red Polyurethane tread on Silver Cast Iron core wheel with a roller bearing and 3/4" bore. Supports 2000 pounds (lbs) per wheel.When searching for a reliable and durable solution for wheels, consider Service Caster’s polyurethane tread on semi-steel cast iron core wheels. With a roller bearing with a 3/4" bore, this wheel is ideal for material handling, carts, equipment, and shop projects. The non-marking, non-marring polyurethane tread performs especially well on hard surfaces such as concrete, tile, and wood, while the metal core wheel stands up to heavier loads with a stable and secure roll. Polyurethane tread with a cast iron core is ideal for a wide range of applications, such as 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. Service Caster is unsurpassed in quality, reliability, and excellent customer service. Count on us to move you forward.