These steel discs are not magnets, but instead are used as a striker plates which magnets can then attract to. They are perfect for arts and crafts and for galleries and exhibitions with premium 3M™ self-adhesive on one side and a discreet black painted finish on the other.
If you are looking to use a magnet then you need a steel surface, or another magnet, to attract to. A magnet will attract to a steel surface in direct contact with equal strength as a magnet to magnet arrangement, therefore, self-adhesive steel discs can sometimes provide a more cost-effective solution. However, it is important to remember that if there is a gap between the two, then a magnet to magnet attraction will be stronger.
These small black painted steel discs are supplied with convenient, strong 3M™ self-adhesive on one side which means they can be stuck to almost any hard, flat surface to create a magnetic surface. They are an essential part of any crafting tool kit and are often used by galleries to hang artwork.