Petzl JAG System lightweight 4 to 1 progress capture hauling system Haul kit for pickoffs, making a releasable anchor, or tensioning a system, thanks to its 4:1 mechanical advantage and excellent efficiency (sheaves with sealed ball bearings). The collapsed kit is very compact, making usage possible even if the distance to the anchor is very short. Comes with two Am'D TRIACT-LOCK auto-locking carabiners. JAG and JAG TRAXION pulleys also available separately for making long haul systems (e.g. confined space descent/ascent system). Sheave type: sealed ball bearings Rope diameter: 8 mm