Brass Cup Chain Ends, Rhinestone Cup Chain Connectors, SilverSize: about 3mm wide, 6mm long, 2.8mm inner diameter, hole: about 1.2mm.The cup chain ends fit up to lay about 2.8mm wide rhinestones cup chains.â Usage: This cup chain connectors can help to change your rhinestone cup chains into a necklace, bracelets, earrings or other DIY jewleries you like. The loop on the top provides convenience for you to attach to lobsters or jump rings. â Easy to Use: Lay the cup chains in the connectors and compress the sides for secure hold with a plier; Glue also can be added for more security. Then, attach the loop to a lobster clasp with a jump ring.