Figure-eight descender. The square shape of PETZL figure-eight descenders reduce twisting and kinking of the rope while rappelling. A little detail you will appreciate! The small oval shaped hole allows use on thin ropes, or use as a belay plate. The Huit D01 features an antiburn grip which allows the device to be handled when hot from a long or fast rappel. The Petzl Huit is made from forged aluminum and then anodised. For use on single or double ropes from 8 to 13mm. 110 grams.