... .Material:porcelain basses,inserted material:cooper 2.Used for insulator and fixed the conducter Dimension: 1617 Porcelain Low Voltage ... .ANSI standard2.Good quality and better price for ceramic insulator.3.Used for insulation and fixed the conductor.4. ... technicians which specialize in electronic products.Our main products are lampholder,plug,socket,switch,tester,extension socket and other electronic ...