These synthetic, jewelry quality, crystal rivets are popular in western fashion for decorating leather belts, garments, handbags, and more. Can be used on up to 8-9 oz. leather. To set, use the Synthetic Rivet Setter Kit, item #144-346200. Also can be used in conjunction with our Bezel Conchos. 5 mm. 100 pack. Item #378-1656.