Roofing bolt 1.Bolt Size,M5-M20 2.Material,stainless steel,carbon steel 3.SGS,ISO 4.Zinc or Nickel plated,Black Oxide,HDG Roofing bolt 1. Standard:DIN, ANSI, BSW, JSB ans ISO standard or non-standard as request&design.2. Material:Carbon steel, Alloy steel, stainless steel or according require.3. Grade of Roofing bolt:Metric standard: Grade 4.8, Grade6.8, Grade8.8, Grade10.9,Grade12.9.Inch ...