These vent covers have various applications and are suitable for outdoor and indoor air ventilation. Widely used as room exhaust vent covers, attic vents, louvered vents, garage door vents, RV or wall vents, shed vents, cabinet vents, etc., Whether you use it in residential, commercial,l or industrial buildings, these vent covers will meet ventilation needs.SpecificationColor: WhiteMaterial: Aluminum AlloyTotal Size: 100 x 100 mm / 3.94 x 3.94 InchMounting Hole Distance: 85 mm / 3.35 InchPacking List: 4 Pcs x Rectangle Air Vent Cover (Screws and Expansion Tube Included)Advantages With its Aluminum Alloy, this vent cover offers excellent corrosion resistance, ensuring it will not rust for a long time.