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Center is a standard carabiner rating. Using a carabiner to connect to a rope. A carabiner or karabiner (/ ˌ k ær ə ˈ b iː n ər /), [1] often shortened to biner or to crab, colloquially known as a (climbing) clip, is a specialized type of shackle, a metal loop with a spring-loaded gate [2] used to quickly and reversibly connect components, most notably in safety-critical systems.
A keychain (/ ˈ k i t ʃ eɪ n / ⓘ) (also keyring) is a small ring or chain of metal to which several keys, or fobs can be attached. The terms keyring & keychain are often used interchangeably to mean both the individual ring, or a combined unit of a ring and fob.