... lampholder ring E40 H538B-21. certificate : CE , ROHS2. material: iron , aluminum, copper3. series: E40, E39, E26, B225. enjoyed ... about 20, 0000 tons products.4. Excellent quality with stress quality control process. 5. You can have ... screwshell : iron , copper, aluminium , iron plated copper , copper plated nickel , iron plated zinc , aluminium plated copper e27 e27 lamp holder with wire for best ...