Rope can pass in either direction but when the toothed cam is deployed, the Nano Traxion becomes a one-way pulley made for crevasse rescue, hauling and in emergencies, as an ascender. Safety is ensured as the toothed cam will grip wet, icy and even muddy ropes.The sealed bearing within the pulley housing provides smooth use and ensures you can control the rope with ease.Sealed ball bearingsExtremely lightweight and ultra-compact Rope installation diagrams engraved inside the pulleyLocks even onto frozen or muddy ropesMaterial: Aluminium Weight: 53gMinimum rope diameter: 7mmMaximum rope diameter: 11mm Efficiency: 91%Sheave diameter: 18mmWorking load: 4kNBreaking strength: 15kN