Titanium ring 1.Gr1,Gr2,Gr3,Gr4,Gr5,Gr7,Gr9,Gr12 2. ... -3000mm 3.WT10-400mm, 4. ASTM B381,B348,AMS 4928 Titanium ring1 Grade: Gr1,Gr2,Gr3,Gr4,Gr.5,Gr7, Gr9 ... titanium products over than 2000 T yearly ------We are verified by third-party inspectors. -----We have already passed the SGS test. Titanium ring ...