I received a pack of 10 just to hold a warped 5mm timber. After about a month of use I can say without a doubt that they are not as strong as described. I would return it but found a way to use them for my purpose (by stacking them in a checkerboard pattern) but even then they are extremely weak with a strong seal between the magnet and the metal surface. Extremely disappointed and the product information is dead wrong. The brand I'm considering is DIYMAG and the headline reads Super Strong Neodymium Fishing Magnets, 95 lb (43 kg) pull force.
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