Simple Appearance: Bird house protector has a simple and elegant appearance, matching bird house without affecting the beauty Round Hole Design: Bird house hole protector adopts a round hole design to keep the inside of bird house ventilated Sturdy Material: Bird nest preventer is made of sturdy metal material to ensure long term use Fine Workmanship: Guard is finely made with a smooth and delicate surface to ensure comfortable and safe use Product Size: Bird house hole guard 5.3cmx5.3cm/2.09inchx2.09inch Specification: Material: Metal Product Size: 5.3cmx5.3cm/2.09inchx2.09inch Package Includes: 4 Metal Birdhouse Guards 16 Mounting Screws Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.