Listing is for a a set of four (4) Service Caster Series #20 stainless steel casters, two (2) rigid and two (2) swivel casters with top locking brakes, with 3-1/2″ diameter by 1-1/4″ wide black polyurethane wheels capable of supporting a total weight of 1,000 lbs. (250 lbs./caster).When searching for a reliable and durable solution to your caster needs, look no further than the Service Caster Series 20 top plate stainless steel casters. The Service Caster Series #20 is ideal for light and medium duty material handling, carts, equipment, and shop projects. The luxuriously polished stainless steel finish resists rust and corrosion in indoor or outdoor applications where moisture is a factor, while the non-marking, non-marring polyurethane wheels perform especially well on hard surfaces such as concrete, tile, and wood- rolling on a finely crafted ball bearing design that keeps you moving forward. Service Caster is unsurpassed in quality, reliability, and excellent customer service. Count on us to move you forward.