The Petzl Reverso 3 Belay Device is a super light belay/rappel device that is highly versatile for all sorts of climbing and rope sizes. Designed with an asymmetric V-shaped groove friction channels that allow you to regulate the amount of braking friction on the rope according to its diameter and condition. Great for belaying with double ropes for those long alpine routes or difficult roof cracks and wandering routes, as well as single rope belays with ropes down to 8mm. The Reverso 3 is a great device for anyone who is guiding or taking groups up multi-pitch walls due to its Reverso mode where you can do independent and simultaneous belaying of one or two seconding climbers. You can create quick change over from Reverso mode to belaying the leader when climbing multi-pitch routes.