Internal thread M4 x 1 (fine thread).
|Outer Diameter (cm):||1.0 (0.39 inch)|
|Diameter of opening (cm):||0.4 (0.16 inch) M4|
Metal decorative ball, silver colour, 1.0 cm (3.9 inch).
Internal thread: M4x1.
You can use this lamp part if you want to neatly finish the end of an upright / protruding piece of threaded rod.