The Mounting Flange by Squirrel Stopper is the quick and easy way to provide a safe and secure mount for your birdfeeder or birdhouse. Insert the flange over a 1 inch diameter pole and tighten the thumbscrew for a tight fit you can feel confident about. Screws are included to attach to your birdfeeder or birdhouse. Made by the same company who brought you the Squirrel Stopper pole system! Dimensions are 4x4x2 in. Fits over poles with 1 inch outer diameter.