Features: The air vent cover is made of high-grade plastic, durable and solid. This air vent cover is rustproof and no yellowing. It is designed for removing air in residential buildings, offices, kitchen, bathrooms or other air conditioning systems and can be installed on ceiling and wall. Beautiful and durable; Easy to install; Specifications: Material:Plastic Color:White Option Type:Inner Diameter 75mm Air Vent;Inner Diameter 100mm Air Vent;Inner Diameter 150mm Air Vent;Inner Diameter 200mm Air Vent; Inner Diameter 75mm Air Vent: Outer Diameter:Approx.120mm/4.72in; Thickness:Approx.70mm/2.76in; Inner Diameter 100mm Air Vent: Outer Diameter:Approx.150mm/5.91in; Thickness:Approx.70mm/2.76in; Inner Diameter 150mm Air Vent: Outer Diameter:Approx.210mm/8.27in; Thickness:Approx.75mm/2.95in; Inner Diameter 200mm Air Vent: Outer Diameter:Approx.250mm/9.84in; Thickness:Approx.90mm/3.54in; Package Includes: 1xAdjustable Air Vent note: Please allow 1-2cm errors due to manual measurement,please make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.