PETZL SWIVEL OPENDetailed description Can be attached to a wide range of products (pulleys, lanyards) because of its large opening. Reduces bulk and weight of component systems. Solves the twisting and tangling problems of ropes and lanyards in different situations: hauling: prevents rope twist when the load turns on itself, thus reducing kinking hauling: avoids the risk of friction between ropes, which improves efficiency progression with a lanyard: avoids twisting