Is should be precision nut driver but how many mm/inch anyone please I am moving out and I'd like to take my door bell with me
if anyone have it can just take a measure
It's a pretty particular tool.
The stud that you screw in is small - only about 2mm across the flats.
And the L-shaped allen-key type tool has a smooth round bar outer, as it has to enter the camera body as you tighten that stud.