Antiqued Copper Engraved Concho Necklace Pendant Adapter. Jewelry making made easy. Turn any Chicago screw backed Concho into a pendant for Necklaces. Mix and Match Conchos for every occasion. Fits conchos from 1/2″ to 2″, Fits necklaces up to 4mm wide. Measures 1-7/8″ Long. Antiqued Copper Color Plated Alloy.