1, Zinc Plate & Trivalent Chromate 2, Zinc Plate Trivalent Chromate 3, Zinc Plate with Trivalent Chromate 4, Zinc Plated (Cr3+) 5, Zinc Plating + Blue Hexavalent Chromate 6, Zinc Plating + Blue Hexavalent chromate + top coat 7, Zinc plating + blue trivalent chromate 8, Zinc Plating + Blue Trivalent Passivation 9, BLUE ZINC CR3+,8um MIN 10, BLUE ZINC TRIVALENT