Joerg wrote:

In the lower picture you can see what
I mentioned in another thread: Fixed
wrenches, in contrast to adjustable ones, are
always larger than the nuts. Have to be in
order to account for tolerances. So they
never grab cleanly which will wear the nut
over time and also ding it.

Well... doesn't any wrench has to be bigger
than the nut in order to grab it?

Adjustable tools doesn't offer a tighter grip.
Even if it could in theory just feel the part
that is adjustable - you can almost always ruck
it back and forth, just a bit but nonetheless.

Also the adjustable wrench is often used in
a careless manner. People don't adjust it to
perfection before they pull!

No, fixed keys are the best and in particular
the ring side (closed end) of the combination
spanner as that pulls on all sides of a hex
bolt or nut.

--
underground experts united
http://user.it.uu.se/~embe8573