10mm Ball Joint Old English 
This Ball joint is perfect for angling a wall light downwards for reading etc.
It has a thumb screw on the side to lock the position.
The joint is hollow allowing a cable to be run through it internally.
Will angle 90 degrees.
The joint has a 10mm male thread one end and a 10mm female thread the other.
Length (straight): 37mm
Width (including thumb screw): 34mm
Thread 10mm x 1mm pitch
Internal cable hole: 7mm
Finish: Old English