Exquisite and high-quality workmanship makes it anti-rust and anti-corrosion. The hemispherical design makes it possible to reduce resistance and more efficient. The 45-degree inclined louvers make it possible to prevent rainwater from getting in. And the fixed buckle design makes it very stable and anti-dropping. Made of 304 stainless steel material, it is very durable to use. There are nine specifications for you to choose from: 50mm, 60mm, 80mm, 100mm, 120mm, 150mm, 160mm, 180mm, 200mm. It is very suitable for residences, restaurants, supermarkets, office buildings and so on. Item Name: Stainless Steel Vent Outlet Material: 304 Stainless Steel Color: Silver Color Features: Fixed Buckle, Anti-rust, Non-slip Size Details: 50mm: Length: 12.5cm/4.92", Width: 12.5cm/4.92", Height: 10.3cm/4.06", Punch Diameter: 5cm/1.97", Installation Depth: 4cm/1.57" (Approx.) 60mm: Length: 12.5cm/4.92", Width: 12.5cm/4.92", Height: 10.3cm/4.06", Punch Diameter: 6cm/2.36", Installation Depth: 4cm/1.57" (Approx.) 80mm: Length: 12.5cm/4.92", Width: 12.5cm/4.92", Height: 10cm/3.94", Punch Diameter: 8cm/3.15", Installation Depth: 3.5cm/1.38" (Approx.) 100mm: Length: 14.5cm/5.71", Width: 14.5cm/5.71", Height: 11.3cm/4.45", Punch Diameter: 10cm/3.94", Installation Depth: 4cm/1.57" (Approx.) 120mm: Length: 14.5cm/5.71", Width: 14.5cm/5.71", Height: 12cm/4.72", Punch Diameter: 12cm/4.72", Installation Depth: 4.8cm/1.89" (Approx.) 150mm: Length: 18.5cm/7.28", Width: 18.5cm/7.28", Height: 14cm/5.51", Punch Diameter: 15cm/5.91", Installation Depth: 4.8cm/1.89" (Approx.) 160mm: Length: 19cm/7.48", Width: 19cm/7.48", Height: 15cm/5.91", Punch Diameter: 16cm/6.3", Installation Depth: 5.5cm/2.17" (Approx.) 180mm: Length: 22cm/8.66", Width: 22cm/8.66", Height: 17cm/6.69", Punch Diameter: 18cm/7.09", Installation Depth: 6cm/2.36" (Approx.) 200mm: Length: 22.5cm/8.86", Width: 22.5cm/8.86", Height: 17.3cm/6.81", Punch Diameter: 20cm/7.87", Installation Depth: 6cm/2.36" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. The edge area of the stainless vent is sharp, pleas be careful Please wear gloves when installing Please keep out of reach of children Package Includes: 1 x Stainless Steel Vent Outlet