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https://www.magnetsw.com/products/magnet-with-eye-bolt/

Magnet with eye bolt, also called magnetic hook eyebolt is made from NdFeB--the world's strongest magnet. NdFeB magnets provide a much stronger suction force than Ferrite magnets.

Structures of Magnet with Eye Bolt
This handy and practical powerful neodymium magnet with bolt has a powerful magnet embedded in a nickel coated steel pot to provide maximum gripping force. The steel pot provides protection for the magnet and concentrates the magnetic force on the magnet's surface. The pot magnet has a threaded male thread, ideal for mounting with bolts or screws.

Applications of Magnet with Eye Bolt
Because of its high magnetic energy and small size, the magnet with eye bolt is used in treasure hunting expeditions, river cleaning, etc. Also you may hear another name as a fishing magnet.

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