Reliable Ascender - the Dome by Fixe! The Ascender can ideally be combined with a rope clamp and thus provides effective ascension with the fixed Single rope. No matter if it is expedition mountaineering or Bigwall Climbing, the ascender provides you good service. Of course it can also be used as a non-return device in a haul system. The serrated clipboard provides reliable footing at the rope and thanks to the holes in its body, the Dome mostly cleans itself.