304 Stainless Steel Material: The round ventilation hood is made of high-quality stainless steel with good corrosion resistance and can be used in various environments. It also has good hardness and strength, making it more durable than other materials. Mesh Screen: This mesh is 45º type to prevent rainwater from entering. There is also a protective net inside to prevent cockroaches and rodents from entering. In this way, you can enjoy a better and healthier life. Easy Installation: Before installation, tilt the side buckles of the vent cap outward to prevent the cap from falling out of the pipe opening. The buckle is easy to remove and clean (please wear gloves to protect your hands during installation). Application: Our wall vents are suitable for 80mm bathroom vents and range hoods, and are also commonly used in residential, office and industrial applications, ideal for indoor ventilation. Package includes: 1 x vent, 2 x M4 2.5cm screws + 2 x expansion tubes