Edison Screw (ES) [E27]
Edison Screw 27mm screw socket.
Lamp holder dimensions are 58mm high by 59mm wide (with lamp shade collar) 40mm without; and has an M10 (10mm) screw mounting thread.
It has a 40mm ring thread with lamp shade collar that can be removed to allow the fitting of a lamp shade.
-E27 White Bulb Holder + Ring
-E27 White Ring Only
-E27 Black Ring Only