The Mule Knot (a.k.a releasable knot) is ideal to lock off the rope on the belay plate. There are many occasions in climbing when, belaying from the harness using a device which does not self-arrest ...

Manual breaking belay device Climbing Technology Click Up it allows for quick and smooth paying out of the rope; it allows the belayer to arrest a fall holding with the hand the free end of the rope; ...