Large white plated brass ball chain clasps, for use with 4.8mm ball chain. White plate is the "silver" color most often seen on base metal jewelry and findings. White-plated components are generally grayer, but also more durable, than silver-plated components. White plating is also known as "imitation rhodium" and "silvertone". These clasps hook both ends of the chain together, to make a necklace or a key ring. If the clasp appears too tight to fit on your chain, gently loosen the clasp with an awl or chain-nose pliers.