Listing is for a set of four (4) Service Caster Series #20 casters, two (2) rigid and two (2) swivel casters with top locking brakes, with 3.5″ diameter by 1-1/4″ wide black polyurethane wheels capable of supporting a total weight of 1,200 lbs. (300 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 polyurethane casters. The Service Caster Series #20 is ideal for light and medium duty material handling, carts, equipment, and shop projects. The zinc plated finish provides durability under any condition, 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.