Here's what other sites are saying:
The Petzl Huit is a figure-eight descender for descending on single or double rope.
On Sale. Petzl Huit Descender FEATURES of the Petzl Huit Descender Square shape to reduce kinking the ropes and formation of a lark's head knot Compact and lightweight The SPECS of the Petzl Huit Descender Weight: 100 g Rope Compatibility: For use with ropes between 8 and 13 mm in diameter Aluminum Case Quantity: 15 ALL CLIMBING SALES ARE FINAL.
The Petzl Huit is a forged aluminum figure 8 descender designed for ropes with 8 mm. to 13 mm. diameters. Return Policy: Climbing equipment sales are final. In order to guarantee the life saving integrity of the climbing gear we sell -- we cannot accept returns on any life safety climbing or mountaineering equipment.
- Appalachian Outdoors
The Petzl Huits figure 8 square design reduces twisting of the rope and risk of girth hitch formation while rappeling.