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Simply tighten the topmost knurled nut to compress the rubber for a snug fit. 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. Listing is for a set of four 4 Service Caster Series #20 1-1/2'' expanding stem swivel casters with 5'' diameter by 1-1/4'' wide red polyurethane wheels and top locking brakes capable of supporting a total weight of 1,400 lbs.