Find the perfect length for your favorite chains and necklaces when you add this curb chain extender in solid sterling silver. Crafted in solid sterling silver 1. 8mm-wide curb chain links allow you to adjust your chain - sold separately - to your desired length. Simply attach the extender clasp to the end of your chain and secure your chain's clasp to any link along the extender. Works with almost any chain this 3. 0-inch extender includes a lobster claw clasp.