The carabiner is a special type of release buckle with a spring-loaded gate metal ring for quick and reversible attachment of components, most notably in safety-critical systems. The carabiner is divided into three main locking categories: non-locking, manual locking, and automatic locking.
The carabiner is widely used for rope-intensive activities such as climbing, fall protection systems, arboriculture, cave exploration, navigation, hot air ballooning, rope rescue, construction, industrial rope work, window cleaning, rappel rescue, and acrobatics. They are mainly made of steel and aluminum. The weights used in sports tend to be lighter than those used in commercial applications and rope rescue.