Listing is for one (1) Service Caster Series #20 stainless steel swivel caster with a 5" diameter by 1-1/4" wide soft rubber wheel and a 3/8"-16 X 1-1/2" threaded stem capable of supporting 275 lbs./caster. When searching for a reliable and durable solution to your caster needs, consider Service Caster?s 316 stainless steel soft rubber casters. SS316 casters are ideal for light and medium duty material handling, carts, equipment, and shop projects. Built with 316 stainless steel, which contains additional molybdenum and nickel content, making it more corrosion resistant than standard 304 stainless steel. The soft rubber wheels- resistant to most chemicals and oils- combine a soft tread on a hard rubber core, offering quiet movement and a cushioned ride. 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.