This sterling silver end cap mounting is designed for our 2mm flex tube bracelet; the four-prong mounting holds one 6 x 4mm octagon faceted stone. The prongs are pre-notched, making it easier and faster to achieve a professional result; use traditional stone-setting techniques to set your stone. Choose end caps that hold matching stone shapes or mix & match the stone shape to create an unusual look. If desired, allow customers to select their own stone types and shapes for a personalized design. Pre-notched prongs provide a professional start to stone-setting with perfectly level stone seats already cut into each prong.