Pole flange plate with 1" center hole. For feeders and houses that can go up and down a pole. Flange has a durable, black powder-coat finish, and is perfect for mounting wooden bird feeders or houses on straight, tubular poles. Will accommodate 1/4" to 1" diameter poles. Solid brass thumb screw secures flange to pole. Zinc-coated screws included. Ideal for mounting seed trays below your favorite feeder. Dimensions: plate with center hole is 3-1/4" x 5-5/8", collar 1" inside diameter x 2" H. By Erva.