Durable and sturdy material: The 6-inch to 4-inch air duct reducer is made of high-quality ABS material, designed for a long service life. It is waterproof and not easily deformed, suitable for both indoor and outdoor use. Smooth and neat edges allow for tight docking, improving ventilation efficiency. Sufficient quantity: Each package includes two ventilation adapters, providing enough units for use and replacement, and allowing for sharing. Applicable size: The dryer pipe connector fits air ducts ranging from 100mm to 150mm, ideal for connecting 6-inch and 4-inch ducts. This makes it a practical accessory for various ventilation needs. Dimensions: The outer diameter of the 150mm reducer is 6.18 inches with an inner diameter of 5.90 inches. The outer diameter of the 100mm reducer is 3.89 inches with an inner diameter of 3.66 inches, meeting standard size requirements. Convenient and easy to install: The 4-inch pipe connector is a practical solution for homeowners looking to upgrade ventilation systems without professional help. It can be installed easily without additional tools. For a more secure connection, glue, tape, or steel clips can be used. Widely applicable: This 6-inch to 4-inch air duct reducer is commonly used in residential and commercial ventilation systems, HVAC systems, air conditioning units, range hoods, garages, attics, bathrooms, and kitchen fans. Its versatile design makes it suitable for most ventilation system installations or repairs. Color: White Material: Plastic Package Contents: 2 x Pipe Connector Note: Light reflection and different displays may cause slight color variations between the image and the actual item. Measurement may vary by +/- 1-3cm.