The listing, 2MM CRIMPING BEADS has ended.
Crimp beads are used at the end of a necklace or bracelet. You loop your beading wire THROUGH the crimp bead, around the clasp (or pendant, etc), then BACK through the crimp bead and then use a crimping tool to squash the bead to secure the fastening. Very easy ... also can use crimp beads as sparkles of silver in a string of beads, but they are tiny and can slide through the holes of some beads!