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A maillon, maillon rapide or quick link is a metal link similar to a carabiner. Maillons haveathreaded sleevewhichtightens over a thread, as opposed to a hinged gate like a carabiner, making them stronger but more difficult to use.In climbing, they are used to construct leave-in-place abseil anchors. Maillons can also be used for fastening harnesses with a dual attachment point.