I should have probably responded to the list rather than pmail. Those
wrenches are used for specialty hardware used for security purposes.

You will find that they are used in elevator cover plates, payphone hardware,
ATM covers, and sometimes bathroom stalls. They are installed to frustrate
the occasional vandal. The tools to remove these are more difficult to obtain.

The small post in the hex hole is what makes these hardware different. They
also come in different numbered sides (triangle, square, and pentagon). There
is no benefit in having these in areas where a vandal cannot get to it
anyway. Too much of a nuisance to have to use a special tool. It would be
good for fog light installations, license plates, water drain flaps. things
that the local neighborhood punk might try to steal.

Of course the pro's have these tools.

BenT
San Francisco