Four casters; 2 fixed and 2 swivel. They were taken from a US General Pro 42 inch toolbox. Good condition: They were hardly used and were removed from the toolbox when it was brand new. There is substantial corrosion on all four casters (See pics). The swivel casters have zerk fittings on the swivel raceways and wheel hubs. The fixed casters have zerk fittings on the wheel hubs. The top plates of the casters measure 4.5 inches by 4 inches. The wheels are 5 inches by 2 inches.