... ,ISO 4.Zinc or Nickel plated,Black Oxide,HDG Roofing bolt 1. Standard:DIN, ANSI, BSW, JSB ans ISO standard or ... steel, stainless steel or according require.3. Grade of Roofing bolt:Metric standard: Grade 4.8, Grade6.8, Grade8.8, Grade10 ... . Surface treatment:Plain, black finished, Zinc plated (Galv), Hot Dip Galvanized, Nickel, phosphate black, DACROMET coating, etc.7. Packing:Carbon, Pallet ...