I needed these for my mailbox. It was not staying closed and so I got these and put them on the inside of my mailbox edges on two sides and these work amazing. Since I was adhering them to a metal mailbox I have no idea how well the adhesive works. I did not it. My door now closes like a normal mailbox and I can feel the pull on these even through two layers of metal. These are strong. I lost my other 4 magnets while organizing and so i had to order more for my sons dry erase clipboard he needed to keep up with his water and medicine.
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