Listing is for a set of four (4) Service Caster Series #30 stainless steel swivel casters, two (2) with top locking brakes, with 6" diameter by 2" wide gray thermoplastic rubber flat tread wheel and delrin wheel bearings capable of supporting a total weight of 2,000 lbs. (500 lbs./caster). When searching for a reliable and durable solution for medium and heavy duty projects, consider Service Caster’s Series 30 stainless steel thermoplastic rubber flat tread on polyolefin core casters. The soft flat tread is made of thermoplastic rubber that is non-marking and non-marring, and on the polyolefin core provides a long lasting, high capacity wheel that is capable of easy rolling under heavy loads. 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 30, keeping you moving forward. In contrast to the zinc plated caster, the luxuriously polished stainless steel finish resists rust and corrosion in indoor or outdoor applications where moisture is a factor. Service Caster is unsurpassed in quality, reliability, and excellent customer service. Count on us to move you forward.