925 Sterling Silver Hammered Rubber Stopper Bead Safety Chain For European Charm Bracelet Fits Pandora, Troll, Chamilia, Biagi and other European style Charm 3mm snake bracelets Slide on (non-threaded) Bead with rubber ring in hole. Hole size can extend from 2mm to 4.2mm Hold and lock the position of beads on bracelet tightly without moving around. Made of 925 Sterling Silver (Stamped) with Silicon Rubber Ring