Socket for duct rail, lighting bar Set of 12 for a great deal! E11 socket compatible spotlight socket, Two-terminal connection. - Type: Spotlight socket - Connection terminals: Two-terminal connection - Internal structure: E11 socket Brand new, unopened. By attaching it to the ceiling or wall rail, the illuminance will increase dramatically. Great for home or store use! This product has a proven sales record, so please feel confident in your purchase. A separate set of 6 is also sold on a different page. Thank you for viewing.