Premium Quality: Made of 304 stainless steel, the hardness and anti-rust performance are better than 201 stainless steel. For normal installation, please wear a pair of gloves before attaching the cap. Mesh Screen: The middle part has a mesh filter which can protect the insect house. The semi-wrapped design cap, prevents rain and wind from entering the house. Wide Application: Ideal for all dryer vents, bathroom vents and extractors, air conditioners, kitchen fans and vents, all wall vents, heat transfer and ventilation systems, gas and electric clothes dryers, extractor hoods as well as a variety of industrial applications. A perfect replacement for the old or rusty drain plug in your home. Sizes: The 120mm ventilation grille is, total length: 14.5mm; Outside diameter: 11.5mm; Duct Height: 4.0mm. Please check size chart before purchase, Quantity Shipped: 1 piece