Metal type : 925 Sterling silver Hardness : Hard, Form : Tubing Outside dimension : 9.52mm (0.375") Inside dimension : 8.71mm (0.343") Wall thickness : 0.41mm (0.02") Usage : hinges, settings, bails, eyelets, tube rivets, spacers, bead connector, earrings, bracelet, ring, necklaces, pendant, keychains, charm and more. For tube settings, choose heavy-wall tubing with an outside diameter about 0.5mm larger than your stone.