... , anti-corrosion(ISO 9001 2008). We can produce high quality bolt and nut per customer's requirements. The feature of our ... , carbon steel, coppersurface treatment: zinc plated, passivation, dacroblack,size: M6,M8,M10,M12,M14,M16,M18,M20Length: 50-300mmgrade: 3.6 ...