Features: Make of Stainless steel materials, Enduring and strong, rustproof and wear-resistance.. With fine mesh design, these vent covers effectively prevent any potential damage to your home while providing efficient ventilation. With 45° louver to prevent rainwater from flowing in. Builted in fine mesh grille to stop sundries and small pet from entering the house. Easy to install: Our round vent covers come with screws, installed by inserting the mouth into the ceiling or wall, then you only need to mount it on wall with screws and silicon seal. Suitable for room exhaust and ventilation use, great for garages, sheds, offices, bathroom or campers, and anywhere else air is desired to travel through. Specifications: Materials: Stainless steel Size: 70mm/80mm/100mm/150mm/200mm (as shown in the picture) Package Includes: 1pc Round Air Vent Cover 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.