Step-by-Step Instructions: In-ground sleeve mount: 1. Select a clear flag and flagpole location (above and below ground). Check for underground sprinkler, water lines, electrical lines (call utilities if needed). 2. Dig a 25" hole with a tapered diameter, see diagram below. 3. Put a 3" of gravel under base of aluminum sleeve (allows for drainage). 4. Place the plastic cap in the top of the aluminum sleeve (keeps the cement out). 5. Place aluminum sleeve into hole with plastic cap on top (2" sleeve should be above ground level). 6. Mix bag of concrete and pour into hole. 7. Temporarily hold aluminum sleeve vertical fill in the hole with concrete to 1" below ground level.