... design and produce according to the drawing Spool Porcelain InsulatorSpecifications:Porcelain spool insulator,ceramic insulator 1.Standard:IEC,ANSI,GB,BS, ... and etc 2.Non-standard products:Designed by TCIPorcelain spool insulator,ceramic insulator1.Standard:IEC,ANSI,GB,BS,AS,DIN ... and etc2.Non-standard products:DesignA spool insulator is an insulator ...