Easy to use and effective: Pinch opening of the stop for easy and fast manipulation. This stop is fully integrated into the body of the blocker to prevent inadvertent snagging. toothed with evacuation groove to optimize operation in any condition (frozen rope, muddy ...). Is cam is stainless steel for better corrosion resistance. Bottom hole adapted to keep the appliance flat. Upper hole to fix secure straps and keep the blocker in position. Available in two versions: croll: lightweight and compact blocker. This version integrates a stainless steel anti-wear protection reinforcement for the very aggressive environments. croll: blocker with wide rope passage for excellent fluidity during the ascent.