Roofing bolt 1.Bolt Size,M5-M20 2.Material,stainless steel ... .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 ... oxide,self color SizeM5~M20Length10mm-12mmMOQ50PCSFactoryDongguanRoofing bolt Product pohot examples: Roofing bolt