Features: Crafted from strong with a circular design, these 2 piece duct flanges secure long lasting performances for secure ventilation systems connection. Featuring pre drilled holes and a 3 inch diameter, the flange simplifies installation while maintaining compatibility with dryer , exhaust fans, and HVAC ductwork. Ideal for homeowners, enthusiasts, and HVAC professional seeking stable fittings for residential or light commercial ventilation upgrades. Perfectly adapts to dryer , bathroom/kitchen exhaust systems, or heating/cooling ducts to airflows management in homes, laundromats, or workshops. Engineered for general compatibility, this flange secure leak easy joints in 3 inch duct systems, combining structural rigidity with hassle easy maintenance. Specifications: Component : ABS Bottom diameter: about 10cm/3.94inch Outer diameter: about 7.62cm/3inch Package Includes: 2xFlange Connectors 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.