... polymer insulator fittings composite insulator fitting, isolator, insulator end fitting, end fittings of composite insulators polymer insulator fittingcomposite insulator fitting, polymer isolator accessories, end ... , electric power fittings, insulator end fitting, polymer insulator fittingMaterials: cast steel, with hot-dip galvanization outsideTechnics: casting, forging, turning milling, milling, ...