Large antique brass ball chain clasps, for use with 4.8mm ball chain. Antiqued brass plating is a warm and inviting metal finish that simulates the look of distressed brass. Ball chain is a trendy option for making simple custom necklaces that display personalized charms (like letter charms and symbol charms to express who you are). 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.