FINELED 3PACK Mogul/Goliath (E39/E40) to Mogul/Goliath (E39/E40) Adapters,Socket Extensions, Use This Adapter to Plug an Mogul/Goliath (E39/E40) Bulb Into a Mogul/Goliath (E39/E40) Light Fixture Mogul Base Porcelain Socket Extenders are intended for use in an existing mogul base socket where the light bulb socket needs to be extended to accept your desired light bulb or for aesthetic reasons TransformsLight E39 E40 To E39 E40 Lamp Bulb Socket High temperature resistant, anti-burning PBT and anti-aging Practical and durable, easy to install