Designed as a self-braking system for when the rope suddenly comes under tension the Petzl Grigri has become a standard at sport crags worldwide. Adding a no nonsense mechanical advantage its internal cam auto locks on a big catch to reduce the human error factor. More comfortable when holding tension and smooth on a lower with its lever release the Grigri the preferred device when it comes to aid climbing simplicity and reliability. The Grigri is excellent for belaying a leader or second and single rope descents.