Listing is for one (1) Service Caster Series #20 7/8" expanding stem swivel caster with a 3" diameter by 1-1/4" wide gray polyurethane wheel and a total locking brake capable of supporting 250 lbs. The Series #20 features an innovative expanding stem that can easily adapt to the inside diameter of the opening, allowing for a secure fit in round or square tubes. Finely crafted with a bright zinc plated finish and heat-treated ball bearing raceway, this versatile caster is ideal for work tables, shop projects, or any equipment with round or square tube legs.