Highly efficient large diameter sheave mounted on sealed ball bearings. Toothed cam with self-cleaning slot: works even on frozen or muddy ropes. Moving side piece permits the rope to be installed once the pulley is in place. * Auxiliary attachment point for creating different types of hauling systems. Cam can be locked in open position so device can be used as a simple pulley. Working load as pulley only: 3 kN x 2 = 6 kN. * Breaking strength as pulley only: 11 kN x 2 = 22 kN. Working load as self-jamming pulley: 2.5 kN. Breaking strength as self-jamming pulley: 4 kN. * For use with ropes from 8 to 13 mm in diameter. 95% efficient. CE/UIAA certified.