Features: brand new and high quality Material: Air Vent is Made of stainless steel, high hardness, durable, anti-rust and corrosion resistant. Design: Ventilation Grille Cover is designed of round flat cover with 45°Louver and built-in fly screen mesh,inside louver design has secondly rainproof effect to prevent rain from damage,fly sceen mesh to prevent mice, birds, etc. from nesting. Barb Design: Ventilation Ducting Hose Covers with Barb design, can adjust the angle to fasten the pipe in one-direction, preventing the pipe and the hood from falling off. Hood: The front of the hood is spherical, which can effectively prevent rainwater and debris from entering, and its spherical shape is very good to reduce exhaust resistance Widely Use: The ventilation duct cover can be perfectly used for indoor exhausting,perfect for bathroom vents and extractors, air conditioning units, kitchen fan and vents, all home wall vents and electric dryer etc Specifications: Material: Stainless Steel Internal Diameter:75mm/100mm/150mm/200mm 75mm Outer diameter: 120mm Thickness: 35mm 100mm Outer diameter: 140mm Thickness: 40mm 150mm Outer diameter: 180mm Thickness: 50mm 200mm Outer diameter: 230mm Thickness: 60mm Package Includes: 1x Air Vent Grille note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.