Maillon

 A maillon, maillon rapide or quick link, is a metal link similar to a carabiner. Canyonzone has various shapes and sizes of tights in its range. Maillons have a threaded sleeve that is tighter over a wire, as opposed to a hinged gate like a carabiner, making them stronger, but more difficult to use.
Maillons require the use of open-ended wrench.

The word maillon comes from the French language and means "link".
Maillons are widely used in climbing and caving. In caving they are used to make safe and vital connections such as those required when using single rope technique or to attach ropes to anchor points. When climbing, they are used to construct leave-in-place abseil anchors. Tights can also be used for attaching harnesses with a double attachment point.