A carabiner is a metal loop with a spring-loaded gate used to connect or secure components in various applications. It is commonly made from aluminum or steel and is used in climbing, mountaineering, caving, and other outdoor activities to attach gear to a harness or to each other.
Carabiners come in different shapes (such as oval, D-shaped, or pear-shaped) and sizes, each designed for specific uses or load capacities. The gate mechanism can be either a manual screw-lock or an automatic locking system for added security.