Figure 8 Rappel Device

The "Eight" type trigger device is designed for insurance and descent along single or double rope in industrial mountaineering and rock climbing.

Insurance is provided by creating additional friction during the passage of the rope through the elements of the device.

Benefits:

convenient etching of the rope.
does not twist the rope and through it you can insure both single and double rope.
provides easy descent
effectively removes heat when descending a rope