Petzl Fixe Pulley Ascenders & pulleys Allows a hauling system to be set up when used with a mechanical ascender Also useful for redirection of the rope to avoid rope drag and wear High efficiency due to the sheave mounted on self-lubricating bushings CE/UIAA certified. Efficiency: 71 %. Breaking strength: 2 x 11 kN = 22 kN. Working load: 2 x 2.5 kN For use with ropes of maximum diameter 13 mm. Weight 3.2 oz (90g)