Petzl Jag Hauling System 577829701 Easier handling: sheave mounted These blocks are rope Easier handling: sheave mounted on sealed ball bearings for excellent efficiency gate opening on the pulley side facilitates installation of the rope when the pulley is fixed to the anchor may be used with a CAPTIV positioning bar to favour loading of the carabiner along the major axis and to limit the risk of it flipping Keylock system prevents any accidental snagging of the carabiner when putting the pulley in place ABS resin contoured handle with non slip grip Material(s): aluminium 4:1 mechanical advantage allows user effort to be divided by 4