SSWYV- Exquisite and 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 or 4.92", Width: 12.5cm or 4.92", Height: 10.3cm or 4.06", Punch Diameter: 5cm or 1.97", Installation Depth: 4cm or 1.57" (Approx.) 60mm: Length: 12.5cm or 4.92", Width: 12.5cm or 4.92", Height: 10.3cm or 4.06", Punch Diameter: 6cm or 2.36", Installation Depth: 4cm or 1.57" (Approx.) 80mm: Length: 12.5cm or 4.92", Width: 12.5cm or 4.92", Height: 10cm or 3.94", Punch Diameter: 8cm or 3.15", Installation Depth: 3.5cm or 1.38" (Approx.) 100mm: Length: 14.5cm or 5.71", Width: 14.5cm or 5.71", Height: 11.3cm or 4.45", Punch Diameter: 10cm or 3.94", Installation Depth: 4cm or 1.57" (Approx.) 120mm: Length: 14.5cm or 5.71", Width: 14.5cm or 5.71", Height: 12cm or 4.72", Punch Diameter: 12cm or 4.72", Installation Depth: 4.8cm or 1.89" (Approx.) 150mm: Length: 18.5cm or 7.28", Width: 18.5cm or 7.28", Height: 14cm or 5.51", Punch Diameter: 15cm or 5.91", Installation Depth: 4.8cm or 1.89" (Approx.) 160mm: Length: 19cm or 7.48", Width: 19cm or 7.48", Height: 15cm or 5.91", Punch Diameter: 16cm or 6.3", Installation Depth: 5.5cm or 2.17" (Approx.) 180mm: Length: 22cm or 8.66", Width: 22cm or 8.66", Height: 17cm or 6.69", Punch Diameter: 18cm or 7.09", Installation Depth: 6cm or 2.36" (Approx.) 200mm: Length: 22.5cm or 8.86", Width: 22.5cm or 8.86", Height: 17.3cm or 6.81", Punch Diameter: 20cm or 7.87", Installation Depth: 6cm or 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 OutletProducts from GuanGuan's store