Compact emergency ascender. In a bind, this ultra-lightweight jammer can be used to build hauling systems or as a Prusik-replacement in self-rescue situations. Use with the ULTRALEGERE pulley for a lightweight emergency hauling kit. For use on single ropes 8-11mm with a locking carabiner having a 10 to 12mm round or oval cross section, such as the Am’D, ATTACHE, WILLIAM.