Read the instructions completely before starting and verify you have the materials and tools listed
Select a good location for placing your flagpole, check and make sure there are no power lines above or below ground.
Dig a hole 12" in diameter and either 19” deep (16' pole), 24” deep (20' pole), or 28” deep (25' pole) depending on the size of the flagpole, using the size of a typical posthole digger, in firm or heavy soil. A large hole maybe necessary in loose or sandy soil.
Place the pea rock or gravel in the bottom of the hole and level to a depth of approximately 4". The pea rock or gravel will help with drainage.
Install the 3 1/2 ” stop bolt in the ground sleeve and the nut on the other side of the bolt. Tighten nut so that the bolt is not clamping down too tight on the ground sleeve.
Place ground sleeve in the center of the hole and lay the level on the ground across the hole next to the ground sleeve. You should have 1" of the ground sleeve above ground level. If not remove ground sleeve and add or remove pea rock or gravel as needed to obtain the 1" measurement above the ground level. (We have heard of folks that they have the top of the ground sleeve on ground level so they can remove the pole and go over it with their lawn mower).
Wedge 4-5 medium size rocks between the ground sleeve and the side of the walls. This will further secure the ground sleeve after the cement in the hole has dried.  
Pour concrete into mixing container and then mix as directed.
Have your assistant hold the flagpole in the center of the hole and use the level to check the flagpole's alignment. Now pour the concrete into the hole and make sure that it will slide through the rocks and all the way to the bottom of the hole. Top of the cement will be approximately 2” below ground level. Check two locations on the pole 90 degrees apart with the level to insure the pole is level straight up and down. Allow concrete to set before removing pole from the ground sleeve.
Let concrete harden according to the manufacturer's requirements. We recommend placing a warning flag or some object by the ground sleeve. This will protect the ground sleeve from being disturbed as well as eliminate the chances of personal injury while the cement hardens.
Allow at least 24 hours for the cement to harden before you can raise the flagpole at its highest position.

Warning: Install the flagpole AWAY from any electrical wires, at least the length of the pole plus five feet!!

Improper installation will void your warranty!

Materials and Tools Required For Installation
Not Supplied:

• 1-2, 40lb Bags of Cement (Standard or Quick Drying)
• Tape Measure or Yardstick
• Level
• 20lbs of Pea Rock or Gravel
• Container for Mixing Cement
• 1 Assistant(Optional)

Note: An alternative way to secure the ground sleeve in sandy soil is to cement the sleeve in a five gallon bucket and bury the bucket into a larger hole in the ground as above.