1.material:stailnless steel, carbon steel 2.standard:DIN JIS BSW ANSI GB 3.surface:zinc plated, nickle plated Yongnian Xiongguang Fastener Manufacturing Co.,Itd is a factory of manufacturer and deal specially with the exportation of fasteners including Hex agonal nut DIN934 DIN555 UNC BSW; Hex agonal bolt DIN933 DIN558 UNC BSW;Flat Washer DIN125 Spring washer ;Thread rod DIN975;Drop in anchor; ...