This sterling silver extension chain is approximately 6 cm long (~ 2.25") and has 3.5 mm wide oval links with a cute ball end on one side and a jump ring on the other. It also has a balloon lobster clasp that you can use when you make your bracelet or necklace. It will increase the size of your item up to 2" inches.  The photo shows the balloon clasp attached to the extension. The clasp is another 6x14 mm including the jump ring. Look also for the other extensions in my store.