The Grigri is probably a very classic tool to every freeclimber - now in the updated version. The self-braking system is the last component in the 5:1 base pulley system - the heart of every pulley slackline tightener. The Grigri allows fast rope transfer in the tightening direction and stops the rope in the opposite direction. The 3:1 multiplier is build-up around the Grigri. The mounted lever allows easy loosening of the slackline while derigging.