This magnet is very strong and very well constructed. The eyebolt makes it ideal for mag fishing, especially with an extra lock washer and bottle of Loctite. (DO NOT TRY AT HOME, WARNING). about 1/8 inch thick. I could hang from a magnet, I weigh about 150 pounds. I had to use a long rod through an eyebolt to pry and get enough pressure to take it off. It can hold a lot more than 150, I was just curious :D. He also put a wrench in it and couldn't pull it out.
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