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Finely crafted with a bright zinc plated finish, heat-treated ball bearing raceway, and a red polyurethane wheel, this versatile caster is ideal for work tables, shop projects, or any equipment with round or square tube legs.. 350 lbs. Listing is for a set of four 4 Service Caster Series #20 1-5/8'' expanding stem swivel casters, two 2 with total locking brakes, with 4'' diameter by 1-1/4'' wide red polyurethane wheels capable of supporting a total weight of 1,400 lbs.