Lobster clasp

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A silver lobster clasp, attached to a piece of jewelry, enlarged to show details

A lobster clasp, also known as a lobster hook, or bocklebee clasp, is a fastener that is held closed by a spring. The lobster clasp is opened or closed by holding a small lever, usually with a fingernail, long enough to apply, then it is attached (or removed from) a short link-chain or a ring-like structure. Lobster clasps are often used for necklaces, bracelets, and keychains.

Lobster clasps are named as such because of their "pinching" mechanism, and they are often shaped like a lobster's claw.