Description: This product is made of high quality and durable plastic. It can be installed in the outer wall or ceiling, prevent the pest into the room by net. And it is also a decoration of supply and exhaust vents of public, residential and industrial ventilation systems. You can keep indoor and outdoor air circulation through this ventilation grill. A good choice for your home, office or anywhere you want. Specification: Condition: 100% New Brand Material: Plastic Color: White Hole Inner Diameter: Approx. 5.14 mm Hole Outer Diameter: Approx. 9.44 mm Type(L x W): Approx. 15 x 15 cm / 5.91 x 5.91 inch                                 20 x 20 cm / 7.87 x 7.87 inch(Optional) Weight: Approx. 130g(15 x 15 cm) / 255g(20 x 20 cm) Package Included: 1 x Ventilation Grill Note: For different monitors, the color may vary slightly. Besides, please allow some errors of manual measurement, thank you for your understanding! Features Efficient Airflow--The design of this air vent allows for efficient airflow, which can improve the overall air quality in your home or office. Application--Suitable for covering ceiling openings and ducting vents, practical and durable to use. With Fly Screen--Equipped with fly screen, it opens automatically when the wind blows. High Quality Material--This material will not be corroded and very easily cleaned up. You can use it safely for a long time. Easy Installation--This air vent is easy to install and comes with all necessary hardware for a hassle-free installation process.