! Product IntroductionThis ventilation round cover fits for air and ventilation in the household relatively proof.Made of plastic it can withstand wear rust and aging. Stylish durable and functional.! Wide Range Of UseSuitable for air and air pressure balance of furniture such as shoe cabinet doors wardrobe back panels drawers sink panels etc.Good for daily use in the home office shops etc.Usage:Drill a hole according to the diameter and fix it with a buckle or with adhesive.Note:Please ensure the size you need first before purchasing.! FeaturesReliable Material: PlasticDimension:30 x 11mm / 1.2" x 0.43" (Max Dia x H)Fit Hole Diameter: 25mm / 1''Each Hole Size: 2mm / 0.08"! What You Get20 pieces of air vent covers.