Gummimagnet m. indvendigt gevind, Ø20 mm. knivskinne The metal not only makes

The metal not only makes the magnet stronger but also more resistant to impacts

Made of stainless steel

Thin out the blackboard varnish with a little turpentine if you think it is too thick or difficult to paint with

These signs  with 1 mm

So if you hang it on a glass surface

Gummimagnet m. indvendigt gevind, Ø20 mm. knivskinne The metal not only makesSmall but powerful pot magnet with rubber coating and internal steel thread (M4). The magnet is made with N42 neodymium. And the internal thread is made with Q235 steel. Diameter: 2 cm. Height: 0. 6 cm. Thread: M4 Strength: approx. 3. 2 kg. This magnet can be used together with a M4 pot magnet with external thread. And you can also use it with a M4 screw. The internal thread goes all the way through just push your screw all the way through the rubber