For those of you who love to layer your necklaces, if you had one wish you would use it on this!! Are tired of your chains getting all tangled up and your clasps ending up at the front instead of the back? This clasp will keep your layering necklaces from tangling together and everything where it should be. Easy to open and close, and a tension spring on the inside tube gives the clasp a more secure hold so it won't accidentally slide open. It's just like magic!