Intended for moving on fixed ropes (as a back-up belay), for hauling heavy loads, and as a progress capture device in hauling systems.
Very secure attachment to the rope: installation is done by threading one end of the rope through the device, thus greatly reducing the chance of accidental disconnection from the rope.
Can replace a Prusik hitch for making an adjustable lanyard.
Very compact and lightweight.
Slides easily up the rope and jams when the cam is loaded.
Slides easily downwards if the cam is prevented from engaging.
If overloaded or subjected to an impact force, the rope may slip through the device.