The carabiner is a metal ring, part of which opens.
Carabiners are used in many activities that require the use of rope. Carabiners are used in mountaineering, climbing, caving, boating and some military and industrial operations.
The word "carabiner" is derived from the German word Karabinerhaken meaning "carabiner hook".
Sports carabiners are usually made of lightweight aluminum alloys. Most industrial carabiners are made of steel.
Carabiners are made in two general forms, D and pear, and in simple and complex forms, each of which has a specific application. The resistance of the carbine (the amount of weight it can bear) is written on its body.