Listing is for a set of four (4) Service Caster Series #35 swivel casters with 6" diameter by 2" wide polyurethane on cast iron wheels and maintenance free precision ball wheel bearings. Capable of supporting a total weight of 4,800 lbs. (1,200 lbs. per caster). When searching for a reliable and durable solution for medium and heavy duty projects, consider Service Caster?s Series 35 polyurethane on metal wheel casters. The Service Caster Series #35 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. Finely crafted with double ball bearing heat treated raceways, these versatile casters are 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 on the Series 35, keeping you moving forward.