Buy these small but powerful magnets and youll find a myriad of uses for them and when you buy these two packs youll save 2 too although only 1cm in diameter these mini magnets can support the weight of keys and tools because theyre neodymium much stronger than conventional magnets use multiple magnets to support heavy items such as bunches of keys or large tools and double up to secure non metallic things like messages and photos to almost any surface