A rotating hook magnet is a handy thing to have when you want to hang up things

Edding 400 Permanent Markers

Not for outdoor use - will rust over time

or you can use an M5 nut

You can also buy more magnets if you want to

Magnetbånd Gråt, 25 mm. 3M A rotating hook magnet isHigh quality magnetic foil (not self adhesive). The cut length is 1 metre. Select metres under "amount" to the right. Width: 2. 5 cm. Thickness: 1 mm. Colour: Dark grey. Strength: approx. 93 gr sq. cm. Very flexible magnetic foil. You can cut it to the desired size with regular scissors. A small "groove" runs on one side of the magnetic foil. If you want to stick glue on the magnetic foil, this is the side you use the groove helps the glue adhere