or you can use an M4 nut

The magnetism is axial with the magnetic poles on the flat sides

If you need larger quantities

svarende til et par viskestykker eller et håndklæde

Magnetbånd Blåt, 40 mm. knivskinne or you can use anBlue magnetic foil, available in 1 metre rolls. Width: 4 cm Thickness: 1 mm Length: 1 metre. Colour: Bright blue. Strength: approx. 80 gr sq. cm. Please note: Magnetic foil is not suitable for magnetic glass boards. This magnetic foil is often used for planning boards, storage marking, etc. It adheres firmly to whiteboards, fridges, magnetic metal, etc. Magnetic foil is incredibly flexible. Here are some of the things you can do with magnetic foil: