... steel 3.SGS,ISO 4.Zinc or Nickel plated,Black Oxide,HDG Roofing bolt 1. Standard:DIN, ANSI, BSW, JSB ans ISO ... ,carbon steel,alloy or as request Finishnickel plated, passivation,black oxide,self color SizeM5~M20Length10mm-12mmMOQ50PCSFactoryDongguanRoofing bolt Product pohot examples: Metal Roofing bolt