You can extend the length of your necklace or bracelet by 5cm by adding this extension chain. This will allow you to make your favorite chain longer whenever you need it. Metal: sterling silver. Plating: 18 carat gold. Dimensions: adjustable length 5cm with lobster clasp. This extension chain will extend the length of your necklace or bracelet by up to another 5cm. Making your favourite chain work for you, simply clip on this adjustable chain extender to give extra length to allow you to wear your chain with various necklines. Featuring a lobster clasp fastening and open links this extension chain is easy to attach to your current necklace and gives you the versatility to switch your style from day to day! All earrings are made from recycled 925 sterling silver and are nickel free and hypoallergenic.