lamp holder,porcelain lampbase,ceramic lampsocket 1)E27,E40,E26,E14,B22 ,E39 2)CE/LVD/ROHS 3)Metal:Copper/ ... /brassContactorIron plated copperCopper/brassStain steelTerminal/ rivetAluminium-zinc alloyCopper/brassMetal:according to customers' choiceAvailable wire0.75mm2 ,0.55mm2 (silica ,braided wire)Voltage110 ... 100% irrevocable L/C at sightManufacturer, have own factory, welcome to visit our factory.