... and short delively 57 -21 Post Ceramic Insulators(ANSI)1)Material: Porcelain 2)ANSI class: 57-21, 57-22, 57-23, 57-24, 57-25, 57-11, 57-12, 57 ... -13, 57-14, 57-15•Specifications:Cat/NOA1034A1035A1036A1037A1038A1039A1040A1041A1042A1043ClassANSI57-2157-2257 ...