Light and power solutions ltd.
BRASS REDUCER HALF INCH LAMP HOLDER ADAPTOR NICKEL 1/2" TO 10MM X2 X4
Lampholder Adapter Convert Half Inch to 10mm Thread in Raw Brass
Standard bayonet brass bulb holder half inch 'Old English' finish
Earth tag half-inch (10 pack)
Safety Switch Lamp Holder Half Inch With Back Plate Cover and Screws - Brushed Antique
ElekTek Safety Switch Lamp Holder Half Inch with Cable Cord Grip - Chrome