Double-Sided Aluminum Interlocking Sign Mounting BracketsDouble sided aluminum interlocking sign mounting brackets are available in styles that fit 3" or 4" (outer diameter) round sign posts. The double sided mounting allows you to mount signs back to back without the need for drilling. They also give you the ability to mount the signs at any desired angle. They are just what you need for 45 degree or otherwise angled intersections. You will find them easy to install, reusable, and long lasting. Each order