This mounting flange from Squirrel Stopper is designed to be able to mount your favorite bird houses or bird feeders on top or on the side. The sturdy mounting flange will be able to hold the heaviest feeders and houses on the market. This mounting flange allows the user to mount on the top and on the side of the flange. Whichever way is best, will work now! In use dimensions are 3.5 x 3.5 x 3.5 in. Fits over poles with 1 inch outside diameter.