This lampholder is ideal for adding on top of your light fitting as it can hold a lampshade, this lampholder comes with 2 shade rings so you don't need anymore to hold the shade.
You can also add a cord grip in the base and use it as a hanging pendant light.
There is a locking screw on the inside the of Base this is to stop the lampholder from unscrewing off of the light fitting.
Please note that all ES lampholders have a locking mechanism that prevents accidental undoing of the body, if you have locked the lampholder and need to get it off this how to unlock an E27 lampholder guide will help you unlock your lampholder.
Female Entry Base: M10x1
Shade ring Base diameter: 38mm
Bulb cap: ES, Edison Screw, E27