Universal switchgear cabinet key

This key is my first 3D object made with openscad. I chose this for two reasons.
It's a nice object to learn how to work with openscad.
And more important: I think every geek, hacker, technician want to have this tool in their toolbox!!!!

This key fits on a lot of cool things.
I tested it with trafic lights and street lights
but this will also work for
For control cabinets, shut-off systems in gas, water and electricity supplies
For technical installations in buildings like air-conditioning and ventilation systems, shut-off valves, mains switchboards etc.

please post your results in the comments ;)