The Piu 2 has been specially designed for compatibility with single ropes, half ropes and twin ropes. Simply clip a carabiner in (specifically designed for the CAMP HMS Nitro and HMS Compact carabiners) and use it as a lever to gradually release tension. The teeth have been optimized for a wide range of rope diameters so climbers can use the same device whether they are rapping fat single lines or catching falls on skinny twin ropes. Features: - Auto-locking when belaying one or two climbers on top rope - Ideal combination with CAMP Nitro or HMS Compact locking carabiners - Diagonal cable prevents the rope from rubbing and jamming - Weight: 80 g, 2.8 oz - Rope Diameter Min (mm): Double 8-9 - Rope Diameter Max (mm): Single 10-11