10PCS Necklace Clasp Size: L 0.63,D 0.3516mm*9mm). Double opening appearance,The appropriate size fits most necklaces and bracelets. Durable Material: Our necklace shortener are made of high quality 316 stainless steel.NO nickel and allergy free stronger and more durable,can use them for a long time. Easy to Use: You just press the spring, hang on the small items and shut down, it will keep your things from falling off. Jewelry extender: The clasp can be applied as bracelet or necklace…