Circular Disc Magnets can be fixed in place using adhesive or can be pushed into circular drilled holes in wood or plastic, many new packaging designs use Neodymium magnets cleverly trapped behind laminations of cardboard to provide invisible closing mechanisms for folders, gift boxes, name badges and even greetings cards than stick to your refridgerator!
Neodymium magnets attract each other with almost twice the force that they use to attract steel objects. They also attract each other through very large distances, even small magnets will attract each other through the thickness of your finger!