Crimp beads are small metal beads with a hole through the centre that are often tube or ball shaped. They are used for securing the ends of beading wire together for adding jewellery clasps. To add a clasp to the end of your jewellery piece, thread the beading wire through the crimp bead, then through the clasp loop and back through the hole in the crimp bead. Once you are happy with the position of the crimp and clasp, crush the crimp bead with crimping pliers, to form a permanent connection.