The Garda Hitch, also known as the Alpine Clutch, is a type of climbing knot that can only be moved in one direction.

It is often used in climbing and mountaineering, such as in pulley systems to haul loads up a cliff.

[1] Attach the two oval carabiners to a sling or cord with both of their gates facing up and out in the same direction.

By pulling on the rope ends, you can see that the hitch locks in one direction but moves freely in the other.

The other end will pull the carabiners together, squeezing the rope between them and locking it in place.