This siemens signal light is made to be fixed on an electric box.
It has a Hex nut to be screw on a sheet an it leave the electrical connection expose.
This model cover the contacts and tight the light on the sheet.
No support needed.
Original version for cable Ø8.3. There is a versione with no hole, so you can make your mesure.
The author marked this model as their own original creation.