V-shaped friction grooves - enables controlled breakingCan be used for rock climbing, multi-pitch climbing and mountaineering:Belays climbersRepels one or two rope strandsCan belay one or two seconding climbers with assisted brakingRelease hole allows belayer to give slack to a seconding climber using one carabinerRounded design - extends life of deviceRope compatibility: single ropes 8.5 to 10.5mm / half ropes 7.1 to 9.2mm / twin ropes 6.9 to 9.2mmCertifications: EN 15151-2, UIAAMaterial: aluminium frameWeight: 57g