Magnetic clasp. Powerful. Inside diameter is 4 x 33 mm. Insert … something wide?

Sometimes the magnet is so powerful, it pulls the magnet out of the other half. In this case, apply some glue and re-insert the magnet into it’s slot, and wait for the glue to cure before using again!

Plated.

Made in Germany. 20mm x 37mm x 6mm By the each.