A Double pulley designed for Tyrolean traverses on a rope, the TANDEM has aluminum sheaves mounted on self-lubricating bushings for efficiency. � Rope compatibility: diameter: 13 mm or less � Sheave diameter: 21 mm � Ball bearings: no � Efficiency: 71 % � Maximum working load: 10 kN � Breaking strength: 24 kN Certification(s): CE EN 12278