Security and style combine in the Rhodium-Plated Scallop Barrel Magnetic Clasp. Each barrel features a small open hole in the center. Slide the end of a necklace or bracelet strand through the hole and crimp the barrel clasp to the strand, close to the opening in the barrel. Test the crimp with the magnet in place to ensure the magnet will lay flat in the barrel and trim the crimp or string accordingly. These barrel clasps feature an elegant scalloped design and a bright silver shine. Please note that magnetic clasps should not be worn with pacemakers.