1.material:The special fastener are i made by iron. 2.surface:nickel. 3. ... ,DIN,AISI,JIS or as your reques Item NameWeld Nut Special FastenersBrand NameZhongguMaterialCarbon steel, stainless steel, zinc alloy, aluminumStandardDIN, ISO,DIN ... zinc, black zinc, chrome plated.MOQ50000 piecesPayment TermT/T, Western Union Delivery Detail20~30daysPacking detailPlastic or poly bags ,then cartons and ...