Lobster claw clasps are the most common, with a little claw that springs open and shut to close. Spring ring clasps: A round metal loop that opens by pressing a small lever. Barrel clasps: Hollow metal tubes that screw together or clamp shut. Magnetic clasps: Two magnetic ends that snap together when close. Box clasps: A rectangular box frame that opens on a hinge to secure the chain. Slide locks: A slidable barrel or box that latches in place. Toggle clasps: A bar attaches to a ring on the other end to close.