... are made based on DIN standard. Item NameHexagon Nylon Self-locking NutsBrand NameZhongguMaterialCarbon steel ;stainless steel,brass,ect.Surface TreatmentZinc, ... , tin, nickel, ect.It can be environmentally friendly as your request.StandardDIN, ISO,DIN,JIS, BSW, ANSI or as ... your requestAdvantageHigh quality ,low in price and good service.MOQ50000piecesDelivery ...