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This round base cup magnet consists of a grade 8 ceramic magnet, one of the strong ceramic magnet grades available. The magnet is seated in a chrome plated steel cup that completes a magnetic circuit so the holding force is triple that of an identical magnet outside of a steel cap. The steel cup also provides protection to the magnet, making it more durable. The outer diameter of the magnet is 3.2", the thickness is .415", and it has a .28" hole in the center which allows for mounting.The product quality is assured by ISO 9001 quality control systems.