The ES Plain Old English Lampholder with 10mm Fixing has a locking screw in the inside of the cap to stop the lampholder from turning when removing the lamp. As it is a plain lampholder you can’t add a shade to this lam holder.
Has a 10mm thread in the cap to fit to a 10mm male thread on the lamp base.
Diameter is 38mm and the height is 58mm
Will require a 3 core flex as this lampholder must be earthed.
As this is a metal lampholder, ensure you use a 3 core mains flex to provide an earth connection to this lampholder.