Line Post Porcelain Insulator 57-1 1,Material: Porcelain 2,Port:Fuzhou 3,Payment Term:T/T,L/C Line Post Porcelain Insulator 57-1 1)Series:57-1,57-2,57-3,57-4,57-5,57-6. 2)Material:Porcelain 3)Standard:ANSI MAIN DIMENSIONS AND STANDARD PARTICULARS Note:The left side of slant is Comman glaze,the right side of slant is semiconductor glaze.