Versatile, lightweight belay/rappel device, for use with one or two rope strands and ability to belay a second climber from the anchor Known for being versatile and lightweight, REVERSO is a belay device for single or multi-pitch climbing and mountaineering. It allows you to belay your climbing partner, rappel, and use Reverso mode to belay one or two seconds. The specific design allows the rope to glide smoothly through the device and reduces wear. It is compatible with most rope diameters: single 8.5 to 10.5 mm, half 7.1 to 9.2 mm, and twin 6.9 to 9.2 mm.