The Air Force 3 provides the leader to belay and lock off one or two following climbers using guide mode. Compatible with single ropes, half ropes and twin ropes down to 7.3mm. It is specifically designed for modern thin ropes. With additional breaking friction using V-grooves for belay it also feeds out slack smoothly and easily. Weight: 86 grams|Rope Diameter Range: 7.3mm - 10mm|UIAA|Includes Be Safe screw gate locking carabineer.