It's easy to create professional designs with the 12mm sterling silver Hide-A-Crimp magnetic clasp set bulk pack. These sterling silver magnetic clasps are meant to hide your crimp tubes. Simply string your wire through the hole in the clasp, crimp the end of your wire, and it should rest safely inside of your magnetic clasp. Be sure to add this clasp before you use the crimp tube. This bulk pack includes 20 clasp sets.