http://jinwang02.itrademarket.com With special Epoxy resin fiber glass winding tube made of special purpose epoxy resin(high-temperature resistance and ultra low viscosity property)and high-quality glass fiber,you can make high voltage and SF6 extra high-Voltage composite bushing from 40.5Kv to 550Kv. The series internal diameter of the winding tube: Φ57, Φ60, Φ64, Φ66, Φ76, Φ83, Φ92, Φ100, Φ103, Φ110, Φ135, Φ145, Φ170, Φ176, Φ188, Φ190, Φ220, Φ240, Φ248, Φ325, Φ370, Φ400, Φ500.