Duck is a climbing device useful for climbing rope even in self-rescue or technical rescue situations. It was created as an emergency blocker useful in recovery manoeuvres, self-rescue, progression in preservation and as a regulator for ropes or straps. Duck automatically stops downhill movement, preventing falling. It is used in mountaineering, caving, tree climbing and rescue operations. Duck is designed for the use of strings with a diameter of 8 to 13 mm. Made of aluminum alloy, its lightness (only 70g) and compactness, do not preclude its strength and strength. It works thanks to a toothless cam that limits damage to the rope, locking when it is subjected to the load and thus preventing it from sliding down. Design and Ergonomics The ergonomic handle and intuitive use make it easy to use even if necessary with one hand. Like every Kong brand product, Duck boasts quality production and Italian manufacture.