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Supports a total weight of 1,800lbs 450lbs/per caster. Not only are they resistant to water, oil, and grease, but because they are non-metallic, these wheels are spark proof, keeping you safely moving forward.. Listing is for a set of four 4 Service Caster Series #20 swivel casters, four 4 swivel casters with 4'' diameter by 2'' wide high temperature phenolic wheel with a bronze bearings.