Crimping pliers are used for jewelry making projects involving crimp beads. Crimp beads are small, metal beads that are placed before a pendant or clasp to hold a piece of jewelry in place. Crimp beads are often used on tiger tail jewelry thread or other non-stretchy string. These special beads hold together loops and are an alternative to knotting the string. In order to keep the crimp bead in place, use the crimping pliers to "close" the bead and secure it on the jewelry thread.