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 feeder to pole. Zinc-coated screws included. Dimensions: plate section 3-1/4" x 5-5/8", collar 1" inside diameter x 2" H. By Erva.