Listing is for one (1) Service Caster Series #20 swivel caster with a 4” diameter by 1-1/4” wide black soft rubber wheel and a 3/4" square stem with total lock brake capable of supporting 200lbs./caster. When searching for a reliable and durable solution to your caster needs, consider Service Caster’s Series 20 square stem soft rubber 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. 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. The square stems are designed to be bolted or riveted onto the inside of angled iron legs or against any flat surface. Service Caster is unsurpassed in quality, reliability, and excellent customer service. Count on us to move you forward.