E27 ES Brass Lamp Holder, Old English Edison Screw, Threaded Body 10mm Entrance
1/2" MALE TO 10MM FEMALE BRASS LAMP HOLDER REDUCER CONVERTER ADAPTOR - AliExpress
ElekTek Unswitched Lamp Holder B22 BC Bayonet Cap with Shade Ring 10mm/M10 x1 Threaded Bottom Entry - Made in UK - Brass : Amazon.co.uk: Lighting
10mm. & 1/2" Brass BC push bar lamp holders
ElekTek Special Safety Switch Lamp Bulb Holder B22 BC Bayonet Cap with Shade Ring - 10mm/M10 x1 Threaded Bottom Entry - Brass - Child Safe Switch Push Bar locks OFF to cut