... .SGS,ISO 4.Zinc or Nickel plated,Black Oxide,HDG Roofing bolt 1. Standard:DIN, ANSI, BSW, JSB ans ISO ... , Alloy steel, stainless steel or according require.3. Grade of Roofing bolt:Metric standard: Grade 4.8, Grade6.8, Grade8.8 ... advantage: We are professional manufactuer, offers better quality control&price and ServiceDimensions details examples: MaterialStailess steel SS301, SS304 SS316 SS430,carbon ...