Also known as the Angled Bracket, this extremely tough 21° bracket is made to stand straight on an angled sandwich board sign or at an angle away from a fence or other structure. It is comprised of a mounting plate and a separate bracket that slides over the screw heads and snap into place. This security feature makes it close to impossible to steal your investment without a screwdriver to release. Mounting plate footprint: 1.25″ wide x 2.25″ tall. Screws included.

https://www.featherflags.com/product/DuraBalloon-A-Frame-Bracket-Kit-25229/