As shown in the picture, the Pelican hook bracelet or earrings have a hinged "pelican" hook that is fed through an eye on one side of the bracelet/earrings. Once the "pelican" hook is turned back against the link to which it is attached, it's secured by a "slip-link." By manually releasing the slip-link, the "pelican" hook can be freed, and the bracelet taken off. Or, for the earrings, once the Pelican hook is released, you can hang various things from the earring. The actual earring attaches to the ear with a standard stud-back
A pelican hook is a piece of nautical rigging hardware composed of a hinged link held closed by a link capable of being released under load. The asymmetric appearance of the two hinged pieces is similar in appearance to a pelican's beak.
Dimensions: Width 3/16" (5mm)