You can fit a square sign into a round hole. For our round sign posts, try our Nob Hill brackets, crossing street brackets, or round post brackets. Top off with an acorn pipe post cap.
• Use green Nob Hill brackets with Nob Hill street signs. Cast iron brackets have a copper rod with screws. These are our strongest brackets, field-proven for over 60 years.
• The Civic sign round bracket fits on the tubular pole, for Civic and Keepsake street signs.
• Circular brackets attach parking or traffic signs to round poles.
No Drill Flag Mount Bracket : Heavy-Duty No Drill Flag Mount...
Part #: K-FLAG-BRACKET-01 4.25" x 2" Flag Mount Bracket with Hardware Verified Purchase5-star
Fit perfectly to the lamp post in my yard.