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Listing is for a set of four 4 Service Caster Series #20 1-5/8'' expanding stem swivel casters with 4'' diameter by 1-1/4'' wide black soft rubber wheels capable of supporting a total weight of 800 lbs. Finely crafted with a bright zinc plated finish, heat-treated ball bearing raceway, and a soft rubber wheel, this versatile caster is ideal for work tables, shop projects, or any equipment with round or square tube legs. Simply tighten the topmost knurled nut to compress the rubber for a snug fit. For added security, further compress the rubber with a wrench via the nut under the swivel raceway.