DIYMAG Super Strong Neodymium Fishing Magnets, 500 lbs(227 KG) Pulling Force Rare Earth Magnet with Countersunk Hole… Price: $12.99 (as of 25/10/2020 20:00 PST- Details) & FREE Shipping.

SUPER POWERFUL – This fishing magnets is 2.36 inch(60 mm) in diameter, adopt strong neodymium magnet for its base. It can offer 400 lbs(181 KG) pulling strength under ideal condition.
HIGH QUALITY – The powerful magnetic force is only concentrated at the bottom, The other three sides are Protected by steel cups that almost no magnetic force and magnetic force equivalent to 10 times the volume of the same magnet. force permanent, long service life. Made under ISO 9001 Quality Systems. 60 Days Money Back Guaranteed!
BEST COATING – Ni+Cu+Ni Triple Layer Coated. The Best Coating Available, which Provides a Shiny and Rust Resistant Coated steel cup provides protection for the magnet and helps to prevent chipping or cracking.