Copper E27 Plain lampholder With 10mm Entry 
Copper E27 Plain Lampholder with 10mm entry 
This lampholder has a 10mm entry for fixing to any 10mm allthread or fixing point.
Has a locking screw located on the inside of the base to prevent the lampholder form unscrewing.
This lampholder has a plain skirt meaning you cannot use this with a lamp shade.