1.GR2,GR3,GR5,GR7,GR9 2.color:Ti natural,Gold,Blue,Purple,Green 3.M2.5~ M64*L ... Item NameTitanium FastenerMaterialPure Titanium and Alloy TitaniumGradeGr1,Gr2,Gr3,Gr4,Gr5(Ti-6AL-4V),Gr7,Gr9,Gr12, etc.StandardGB,DIN, IFI,UNC,UNC,JIS ... and carries through final inspection and field testing"--Raw material (Ti bars):Aircraftgrade Titanium alloy 6Al4V and Ultrasonic inspection for Ti6Al4V ...