Add a magnetic clasp or a magnetic clasp with extra length to your favorite necklaces, bracelets or anklets. The magnetic barrels interlock to create an effortless way to connect jewelry. Set includes 12 clasps total in 2 designs.(There are 4 clasps of each design without extensions that measure 1"L, and 2 clasps in 2.5"l extension and 2 clasps in 2.75"l extension). Made of zinc alloy and brass with silver plating. Can be used on any type of jewelry clasp. Easily lengthen a necklace to accommodate your favorite sweater, blouse or shirt necklines.