lampholder,porcelain lamp socket,ceramic lampbase 1)E27,E40,E26,E14,B22 2)CE/LVD/ROHS 3)Metal:Copper/Iron/Aluminium E39 porcelain lampholder, ... lamp holder,porcelain lamp socket,ceramic lampbase 1.B22,E10,E12,E14 ... , E26,E27,E39, E40 lampholder,porcelain knife switch,fuse unit series etc.2.Metal: aluminium/iron ...