... ,Gr9,Gr12, etc.2.Standard: GB,DIN, IFI,UNC,UNC,JIS, BS,BSW ,ISO3.Specification:Screw:M3-M24 Bolt: M4-M64*L6 ... -max M6-----Hexagon socktet countersunk head screw(DIN7991) the diameter min M3-max M8-----.Hexagon socket button head screw(DIN7380) the diameter min M3 ... ,Gr4,Gr5(Ti-6AL-4V),Gr7,Gr9,Gr12, etc.StandardGB,DIN, IFI,UNC,UNC,JIS, BS,BSW ,ISOSpecificationScrew:M3-M24Bolt:M4 ...