's 46 mm but you probably don't need to take it off unless you need to
> remove the backing plate.  You can certainly replace shoes etc, and I think
> you can replace the cylinder.

If you have a hard time finding a 46mm socket, you can use a standard socket
instead.  It's 1-13/16, which is 46.04mm.  In the larger sockets, the
difference from metric to standard is negligible, so it works.  Sears sells
this socket in 3/4" drive.

>
> If you *do* take it off, remember it has to be torqued to 500 newton-meters
> (360 lb-ft I think?)

Yes.  I use a 3/4" drive breaker bar, and put a 6' piece of fence pipe on it
to break it loose.  When I torque it, I stand about 2' out on the pipe (I
weigh 185#), and then torque to the next slot in the nut.  You will need to
have the car in gear, ebrake on very hard, and some serious wheel chocks to
make this happen.

For the rest of the list, the 3/4" drive breaker bar with a reducer makes a
very nice 1/2" drive breaker bar as well.  If you happen to live in the
Denver area, check out Charlie's used tools, around Larimer and 21st.
Everything is 1/2 of new prices, and lots of snap-on, Craftsman, etc. with
lifetime warranties.

tx,
bmc  :)