Petzl Macrograb Rope Grab 12-19mm, .5"-.75"

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.
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.

Technical specifications :
Individually tested
For use on single rope from 12 to 19 mm in diameter.
335 g