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This listing includes two pieces of neodymium cup magnets with #10 countersunk holes. These cup magnets are made of super strong neodymium magnets encased inside durable steel cups, which causes both north and south poles of the magnet to concentrate on the same side, i.e. the opening side, which triples the holding power to 70 pounds each. The countersunk holes through the magnets are designed for mounting with a number 10 flat head screw which is included in this package for your convenience. Notes: Keep these away from pacemakers and children under 5 years old.