... ISO 4.Zinc or Nickel plated,Black Oxide,HDG Roofing bolt 1. Standard:DIN, ANSI, BSW, JSB ... , stainless steel or according require.3. Grade of Roofing bolt:Metric standard: Grade 4.8, Grade6.8, ... request5. OEM&Customize non-standard products welcome.6. Surface treatment:Plain, black finished, Zinc plated (Galv), ... M20Length10mm-12mmMOQ50PCSFactoryDongguanRoofing bolt Product pohot examples: Roofing bolt