Size:M2-M24 Application:bicycle,steamship ,aviation,industry Standard: DIN, ANSI, BS, GB, ISO. Material:GR1,GR2,GR5 1)Size:M2-M24 2)Application:bicycle,steamship ,aviation,petrochemical industry,industry3)Standard: DIN, ANSI, BS, GB, ISO.6)Material:GR1,GR2,GR5