20 Silver Plated Magnetic Barrel Clasps Jewelry 15mm This is a new set of 20 silver plated magnetic barrel 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 The magnets are so strong that they should not be used by anyone with a pacemaker Each measures approximately 14.5 x 4.5 mm (9/16" x 3/16")