... - 3mm 3) Diameter: 19 - 20mm 4) Material: titanium Gr1,Gr2,Gr3,Gr4,Gr5 Titanium Ring Features: 1) Width: 9 - 12mm 2) Thickness ... : 2 - 3mm 3) Diameter: 19 - 20mm 4) Material: titanium Gr1,Gr2,Gr3,Gr4,Gr5Standard: ASTM B381GredeELEMENT COMPOSITION%TiAlVFeCNHOOther,MaxGrade1Blance__0 ...