The strength of the magnet is determined by how much metal it attaches to. It comes off a fridge door or metal paneling on a car fairly easy. However, I wasn't paying attention and was magnet fishing off and iron bridge. The bridge was nearly a foot thick in certain places. It got stuck on the way up. My friend and I had to basically jerk it with all our strength at the same time to come off. We're both 200+ pounds and were also using most of our bodyweight. Another one got stuck and we had to use a mini crowbar to get it off. Be careful not to use the magnet on thick metal.
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