The Petzl Partner pulley ensures exceptional efficiency owing to its aluminium sheave mounted on sealed ball bearings. For use on ropes between 7mm and 11mm, it can handle big loads but is small enough to fit anywhere or carried on the harness.Extremely lightweight and ultra-compact Quick and easy installation due to the swinging side platesSheave mounted on sealed ball bearings for excellent efficiency Materials: Aluminium Weight: 56g Minimum rope diameter: 7mmMaximum rope diameter: 11mm Efficiency: 91%Sheave diameter: 25mm Working load: 5kN (2.5kN on one strand)Breaking strength: 15kN