Locking magnetic jewelry clasps make necklaces and bracelets simple to attach—locking safely in place. Just fasten magnetic jewelry clasps to jewelry for quick, easy on/off. Interlocking ridges keep magnets securely clasped. These magnetic clasps feature lobster claw closures for secure attachment to existing jewelry so you can wear your favorite pieces with confidence knowing they’ll stay firmly fastened. Plus, these locking clasps slightly extend the length of chains and bracelets for increased comfort. Lobster claws. Set of 4 locking clasps. 70% alloy/25% iron/5% magnet.