RACKBrake bar descender for long descents Designed for caving, RACK is a descender that is easy to manipulate. It is used with 9 to 13 mm diameter low stretch kernmantel ropes on one rope strand and can be used on two strands (8 to 11 mm low stretch kernmantel ropes) to facilitate long descents of over 80 meters. The lifespan of the device can be optimized by replacing the brake bars. Simple to use: very easy to use. The bars engaged on the rope may be