This E27 Half Threaded Gold Lampholder comes complete with an internal earth connect if needed. It has a threaded skirt with a fixed shade ring so an additional shade ring will be required. The base fixing in 10mm and has a locking screw on this fixing to stop it twisting when the lamp is removed. The ES Half Threaded Gold Lampholder is also known as a European Lampholder.
Height is 54mm and the diameter is 39mm on the threade and slightly wider at the fixed shade ring.