... price 3)professional manufacturer Specification:1) Porcelain or glass insulators for low & medium or high voltage2) Voltage: ... spool/shackle type,strain typea. Disc InsulatorsDisc Suspension Insulators for HV LineASNI:52-1,52-2.,52- ... /480,ALP22/520,ALP22/920 c. Post insulatorsPost insulators for high voltage lines (ANSI): 57-1s,57 ... 2,54-3,54-4,54-5 e. Spool Insulators for ANSI & BS 5) Colour: gray,brown ...