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5'' Maroon Poly Wheel Swivel 3/4'' Expanding Stem Caster Set 2 Brakes, 4PK 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. Listing is for a set of four 4 Service Caster Series #20 3/4'' expanding stem swivel casters, two 2 with top locking brakes, with 3-1/2'' diameter by 1-1/4'' wide maroon polyurethane wheels 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. 3.