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Built with 316 stainless steel, which contains additional molybdenum and nickel content, making it more corrosion resistant than standard 304 stainless steel. The non-marking, non-marring polyurethane wheels perform especially well on hard surfaces such as concrete, tile, and wood. 3 Inch 316SS Red Polyurethane Swivel 3/8 Inch Threaded Stem Caster Brake, 2PK SS316 casters are ideal for light and medium duty material handling, carts, equipment, and shop projects. Listing is for a set of four (4) Service Caster Series #20 stainless steel casters, two (2) swivel 3/8"-16 X 1-1/2" threaded stem with brake casters and two (2) swivel casters, with 3â diameter by 1-1/4â wide red polyurethane wheels.