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Listing is for a set of four 4 Service Caster Series #20 1-1/2'' expanding stem swivel casters with 4'' diameter by 1-1/4'' wide blue solid polyurethane wheels and posi locking brakes capable of supporting a total weight of 1,200 lbs. For added security, further compress the rubber with a wrench via the nut under the swivel raceway. Finely crafted with a bright zinc plated finish, heat-treated ball bearing raceway, and a solid polyurethane wheel, this versatile caster is ideal for work tables, shop projects, or any equipment with round or square tube legs.