Lobster Clasp

A lobster 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. 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.