Listing is for a set of four (4) Service Caster Series #20 1-1/2" expanding stem 316 stainless steel swivel casters with 3" diameter by 1-1/4" wide thermoplastic rubber wheels and total locking brakes capable of supporting a total weight of 840 lbs. (210 lbs./caster). When searching for a reliable and durable solution to your caster needs, consider Service Caster?s 316 stainless steel thermoplastic rubber casters. SS316 casters are ideal for light and medium duty material handling, carts, equipment, and shop projects. Built withv316 stainless steel, which contains additional molybdenum and nickel content, making it more corrosion resistant than standard 304 stainless steel. The soft, quiet and non-marking thermoplastic rubber wheels perform especially well on hard surfaces such as concrete, tile, and wood. They are resistant to water, oil, and grease and will keep you safely moving forward. Mounting options include top plate, bolt hole, expanding stem and standard and metric threaded stem sizes. Service Caster is unsurpassed in quality, reliability, and excellent customer service. Count on us to move you forward.