Aluminum interlocking sign brackets are available in styles that fit either 3" or 4" (outer diameter) sign posts. Each order includes a set of 2 brackets. Interlocking sign brackets allow the traffic sign or street sign to be mounted and set at the desired angle without the need to drill through the post. You will find them easy to install, reusable, and long-lasting. Black powder-coat finish. Perfect for neighborhood street sign or traffic sign applications.