Features: brand new high quality The joint is made of galvanized iron material, which is anti-corrosion, cold-resistant, high-temperature resistant, not easy to deform, and durable. The connector base has screw mounting holes, no need to drill holes, and it can be directly fixed on the wall with screws, which is convenient to use. The smooth surface of the ventilation flange is convenient for connecting the air duct. Pipe flanges are widely used in ventilation systems in homes, kitchens, bathrooms, garages and factories, etc. Product parameters: color: gray Material: galvanized iron Interface outer diameter: 73 mm/2.9 inches Diagonal Mounting Hole Distance: 88mm/3.5in Distance between adjacent mounting holes: 43mm/1.7in Base Outer Diameter: 98mm/3.9in Instructions: Screw the flange securely to the air inlet, air outlet, wall, ceiling or other surface to connect to the ventilation system. Note: 1. Please pay attention to choose the appropriate connection outer diameter before placing an order. 2. Screws are not included in the package. Package Included: 1 * pipe connector Note: 1.The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 2.Please allow slight manual measurement deviation for the data. Our products are made of environmentally friendly materials, safe and non-toxic, and will not cause harm to the human body. Please read the product manual carefully before purchasing, and use it correctly according to the operation steps. If you encounter any difficulties or problems during use, please contact us in time, we will solve them for you as soon as possible. Your support is the driving force for us to move forward, and we look forward to sharing your experience and experiences with us. For the quality problems or defects of the product itself, we will provide unconditional return or repair service.