Wicked strong. You need to respect them like electricity. One unconscious moment with one in your hand spells trouble. I passed my hand over my work bench holding a magnet and a screwdriver decided to have a fatal attraction. It could have been ugly. Lucky me it hit lengthwise but it ripped the magnet out of my hand and broke apart. Now I'm one magnet short on my project. You have been warned. Worked well for my project.
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