This fantastic device from the boys at ART is both an ascender and
descender in the one unit! The ART Lock Jack 2 works just like a
climbers friction hitch by pinching the line when weight is applied. The
Lock Jack Sport requires only a few feet of rope weight before it
starts pulling through on its own.
The Lock Jack Sport always stays close to the harness and its low profile design makes it a dream to use.
The same as the Lock Jack but with the added feature of the swivel connection!