hex bolts Material:Carbon steel; stainless steel, brass, ect. hex boltsSize: according to the consumers' requirementMaterial: According to the consumers' requirementSurface Treatment: Zinc, copper, tin, nickel or friendly as your requestBrand: XINYUStandard: DIN,DIN,JIS, BSW, ANSI or as your requestPlace of origin: Zhejiang China (Mainland)Advantage: High quality ,low in price and good service.We ...