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Magnetic Base | Ceramic Mount Magnets
The casing placed around the ceramic magnetic round base focus the strength of the magnets to the exposed surface thus providing a much higher holding strength than a same sized magnet without the steel cup. The magnetic circuit closes through the holding surface so the magnetic field leak is minimized. The steel cup provides a protection on the ceramic magnet which increases the lifespan of the round base magnet.
The magnetic round base is also known as cup magnet.