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Package Content: 2 sets total—2 round ducting reducers (150mm to 100mm/6"to 4") + 4 adjustable metal hose clamps, ideal for connecting round pipes, flexi hoses and fans Size Specification: Reducer (a practical duct pipe reduction coupler) converts 150mm (6") to 100mm (4") ducts; hose clamps fit 91-114mm and 114-165mm ranges, matching most standard ventilation setups Premium Material: Reducers (a durable pipe connector for duct reducer) made of high-quality ABS plastic (sturdy, heat/corrosion-resistant); clamps of stainless steel (rust-proof, durable for long-term use) Easy Installation: No specialist tools needed—place the round rectangular duct transition adapter (reducer) between ducts, secure with clamps and tighten for a quick, hassle-free setup Versatile Applications: Perfect for ventilation/exhaust systems—tumble dryers, bathroom/kitchen extractor fans, hydroponics, in-line fans, cooker hoods, garages and apartments, compatible with extractor fan ducting