6 Inch Stainless Steel Ducting Clamps for Air Ventilation Hose (Set of 2) - Heavy Duty HVAC Clamps for Ductwork, Exhaust Pipes, Dryer Vents - Perfect for Home, Garage & Workshop Ventilation Systems

They are what they are, eh? Easily adjustable with a standard screwdriver and they work great. There are no cons, they work as advertised !!!If you have a need for this type of item, you can't go wrong buying this product. Oh, and it has no plastic, only metal. If you can find these cheaper at a local store, go for it. They work flawlessly, you won't be disappointed.