This self-Braking belay/descender device for use with 10mm to 11mm ropes has become indespensible for many rope access professionals. The caming action of this belay device locks the rope in the event of a fall. Although the GRI GRI 2 may not always be the best tool for other tasks, it also serves well in many ascending and descending situations. In a pinch it can also be used as a progress capture device in hauling systems. It is hard to imagine a more versatile tool.