1.Ceramic Insulator 2. 57 series 3. Appliable standard: ANSI C29.7 4. cantilever strength:12.5KN PORCELAIN INSULATOR 57 SERIESWe can produce porcelain post insulator according with customers' drawing.According to IEC, AS, ANSI , BS ,DIN standards with brown , grey and white glaze. Porcelain Insulator 57 series