Hummer 2006 H2 - Manual (Page 405)

3. Open the tool bag. You will find the following tools
needed to remove the spare tire and flat tire:
A. Jack Handle
B. Jack Handle
Extensions (2)
C. Wheel Wrench
D. Wheel Wrench
Extension
E. Wheel Blocks
Before proceeding, be sure to set the wheel blocks at
the appropriate tires as previously shown.
To use a wheel block, lift
the wheel block as shown
to lock it into place.
Jack B Tools
5-75