These screw-back bezels are easy to use and create a beautiful finished look when embellishing cuffs and bracelets.Use our 20mm round cabs in this Copper plated brass Nunn Design bezel. Glue the shell into the well with E-6000 or a jewelers glue.Mount bezel by placing punching a 2mm hole in cuff or object that the bezel is mounting to. Place screwpost through the hole and screw nut tightly onto post. Cut post with wire cutters flush to the nut. Sand or file post if needed.