High Quality: Extractor fan reducer is made of high quality hard ABS plastic, firm, durable, smooth surface. The hose clips are made of 304 stainless steel, which are rust and strong, not easy to deform, the fixed effect is better. Operating Principle: This circular reducing joint is great for improving the air flow in your home. It enables smooth flow of air or fluid, reduces resistance. It's a smart choice to keep your home's air fresh and comfortable. Size & Package: 1 round ducting reducer 150mm to 100mm – small head: ID 91mm, OD 98mm; large head: ID 150mm, OD 155mm– plus 4 stainless hose clips with 2 adjustable ranges: 91-114 mm (3.58-4.49 inch) and 141-165 mm (5.55-6.5 inch). Easy To Install: There are 4 stainless hose clips in this duct pipe reduction connector. Perfect for keeping your hoses securely joined. You don’t need to buy accessories, 2 extra hose clamps are included as spares, easing your future worries. Wide Application: This round ducting connector works well with bathing trigger fans, kitchen or bathroom exhaust air fan, hydrocultures, extractor hoods, tumble dryers and hydrocultures.It helps keep things ventilated where you need it., Weight: 0.48281235378 pounds, Manufacturer: DYHNE