... . Head Styles: Hex socket head ,Taper head ,Hex flange head ,Torx head ,Button head ,Cup head ,Flange head5.Surface Treatment: Polishing ... ,Gr3,Gr4,Gr5,Gr7,Gr9,Gr11,Gr12,SizeBolt: M2-M64*L6—300mmNut: M2-M64Washer: M2-M64SurfaceTreatmentPolishing, Anodizing, Black oxide or Plating colorFeatureslight weight ...