Friction modes and tie-offs for the HUIT - Petzl USA
Amazon.com : Petzl HUIT ANTIBRULURE Descender - Figure 8 Descender with Anti-Burn Grip for One or Two Rope Strands While Rappelling : Climbing Rappel Devices : Sports & Outdoors
Petzl Pirana Club Figure 8 Descender Green - Bentgate Mountaineering