I bought a pack of these magnets. They worked so well I bought two more packs. They are very strong. I needed to put these big billboards on my car so I made holes in the corners of the billboard and the magnets stick to the car while driving. They give you washers and screws to attach it to the magnet. They are rubberized so as not to damage my car's paintwork. I am really very happy with these magnets.
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