This is a figure eight clasp; infinity style; sterling silver; two sizes available; Double interchangeable clasp. One Latch opens two Claws at once. This has a lever that opens both rings of the clasp; it is a versatile lobster claw clasp explore its creative possibilities for many jewelry designs. Try in bead strands as a shortener or enhancer, attach interchangeable charms and pendants for a variety of fashion. This item is the medium size. Please contact us via amazon buyer seller messaging if you need free split rings to adapt your double clasp to your necklace.