2 Magnetic Tube Clasp Sterling Silver Necklace Parts This is a new set of 2 sterling silver magnetic clasps Great for making necklaces and bracelets These hold as securely as any normal type of clasp, but make jewelry easier to put on and take off These magnets are so strong that they should not be used by anyone with a pacemaker Each measures approximately 21 x 4 mm (13/16" x 5/32")