If I need really strong magnets i generally use old hard drive magnets. Since those are all being used i decided to purchase these. They work great for light-to-medium stuff.They are *not* for outdoor use. They can easily break as highlighted in many other reviews. To hold a small tarp, the magnets had to be doubled up to hold through the tarp and even them, they aren't nearly as strong as other magnets I have tried.Again, great for house stuff, but not recommended for anything outdoors.
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