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Permanent magnets are enclosed in a steel “shell”, thus concentrating the magnetic circuit and generating a higher attractive force than the magnet alone.
They are useful as a flat magnet or magnetic base, for mounting or holding elements in outdoor environments and for many other various possibilities of use. Holding magnets have a steel containment capsule. They are characterized by greater strength, resistance and durability. However, they accept a smaller airgap compared to magnets used without steel coating. They are widely used in many sectors, such as industry, construction, automotive, agriculture and advertising.”