Features: Our 4inch through wall flexible wall duct kits adds wall plates and foils tape, which makes installation and maintenance more convenient, with good sealing, and steels pipe clamps is apply to firmly connect the duct kits, which is stable and enduring. Make of impact resistant Plastic/Metal, which is enduring and can prevent the vent cover from cracking or deforming under direct sunlight. Louvered vent cover easily for maximums exhaust flows to exhaust hot air from the clothes dryer vent and bathroom fan venting. Suitable for universals 4inch diameter vent, using a 3inch to 4inch foams adapters for easy installation. Comes with most of the features you need to install a venting system, whether it for a dryer or a bathroom/kitchen exhaust fan/ceiling fan/ventilation fan, to exhaust hot air from a bathroom/storage shed/basement. Specifications: Component Type: Plastic/Metal Size: As Shown in the Picture Package Includes: 1set Dryer Vent Wall Plate note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to difference between different monitors, the picture may not reflect the actual color.