Brass Folding Crimp Ends, Fold Over Crimp Cord Ends, GoldenSize: about 4mm wide, 8mm long, hole: 1mm.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.