Iron Cord Ends, PlatinumSize: about 3 mm wide, 6mm long, hole: 1mm.â Usage: Cord tips are for terminating necklaces or bracelets. Use with our satin cord, leather, hemp, imitation leather or suede lace.â Easy to Use: Lay the ends of the cords in the folding crimp ends; use a plier to press down the sides at a time to fix the cord tightly on the metal crimp end caps. Finally, attach it to a lobster clasp with a jump ring.