Cadillac 2012 CTS-V Owner's Manual page 424

4. If you have a coin/pierce jack,
attach the jack handle extension
to the jack by sliding the hook
through the end of the jack and
insert the other end of the jack
handle into the wrench.
If you have a hex head jack,
place the hex tube end of the
wrench over the hex head of
the jack.
5. Turn the wheel wrench
counterclockwise to lower the
jack lift head until the jack fits
under the vehicle.