The Petzl Jag double pulley is designed for use with the Jag Traxion double progress capture pulley to make a 4:1 haul system. The sheaves are mounted on the ball bearings for increased efficiency. This pulley will hold rope between 8 and 11mm. Specifications: Weight: 120 g Certification(s): CE EN 12278, NFPA 1983 Technical Use Material(s): aluminum, nylon Min. rope diameter: 8 mm Max. rope diameter: 11 mm Sheave type: sealed ball bearings Sheave diameter: 25 mm Working load: 2 × 1,5 kN × 2 = 6 kN Breaking strength: 2 × 4 kN × 2 = 16 kN Efficiency: 91 %