... be processed under ANSI ,IEC. Type: 57-3 57 Series Line Post Insulator Line Post Insulator used on distribution line and transmission line ... type: ANSI C29.7 type: 57-1, 57-2, 57-3, 57-4, 57-5, 57-11, 57-12, 57-13 ... Each Approx(kg)5.09.5111618Number in standard package63322 line post insulator 57-3