Listing is for a set of four (4) Service Caster Series #20 stainless steel casters, two (2) swivel 3/8" threaded stem with total lock brake casters and two (2) swivel casters, with 5" diameter by 1-1/4" wide nylon wheels. Supports a total weight of 1,200lbs (300lbs/per caster).When searching for a reliable and durable solution to your caster needs, consider Service Caster Series 20 threaded stem nylon wheel 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, and the nylon wheels provide very low rolling resistance, show a high resistance to many aggressive substances, and are maintenance free under normal operating conditions. Not only are they resistant to most chemicals and oils, but they will be sure to keep you safely moving forward. Service Caster is unsurpassed in quality, reliability, and excellent customer service. Count on us to move you forward.