PETZL OSCILLANTE PULLEY: Swing-side pulley for emergency use. Ultralight pulley for occasional use in pulley systems or hauling. Quick and easy installation due to swing side plates. Nylon sheave and aluminum side plate for excellent strength to weight ratio. Certification: CE/UIAA. Technical specifications: Efficiency: 71 % Breaking strength: 2 x 8 kN = 16 kN. Working load: 2 x 2 kN = 4 kN. For use with ropes of maximum diameter 13 mm.