Edison Screw Lampholders are widly used in Europe and are being fitted here. They have a 40mm dia. body and can be in a metal or plastic and a range of colours. When the ES Lampholders are used with a shade you need a large shade fitting. These Edison Screw Lampholders are also known as ES or E27 which is the larger of the screw types in domestic use. The E27 refers to a diameter of 27mm across the thread or cap.