The Sing Tree Rope Wrench ZK-2 manufactured by ISC is a friction device that allows the climber to ascend, descend and work the tree “Single Rope” with a friction hitch. It is not intended for use as primary life support.
This tool is a simple yet effective tool that assists a climber climbing up and down in Single Rope Technique (SRT). The Rope Wrench ZK-2 works by using leverage to force the rope into an S shape, providing friction for a controlled descent. When engaged, the Rope Wrench ZK-2 acts much like a conventional descent device such as a Figure eight. When not engaged, the Rope Wrench ZK-2 provides little interference while ascending the rope. This allows the climber to work an entire tree using Single Rope Technique. The Rope Wrench comes with a mid-line pin to allow quick installation on your climbing line.
The Rope Wrench ZK-2 is recommended for tree climbers who have a working knowledge of Single Rope Technique. This means you have received qualified training and have practical experience climbing SRT. Climbing SRT has many advantages. It allows the climber to ascend at a 1:1 rate of speed. For every foot they pull on the rope they ascend one foot. This is different from the conventional dDRT (double rope technique) configuration of 2:1, the climber must pull two feet of rope to advance one foot.
The Rope Wrench ZK-2 is essentially a descent device that has a neutral gear that allows it to ascend the rope as well. Because of this neutral gear, it is imperative that the Rope Wrench be used with a sturdy and trusted friction hitch. The Rope Wrench ZK- 2 dissipates friction and heat away from the climbers friction hitch allowing the climber to descend.
There are many ways to configure the Rope Wrench ZK-2 properly, but the climber must be secured to both hitch and Rope Wrench ZK-2. Any hitch that works safely in dDRT should work with the Rope Wrench ZK-2. The stiff tether (sold separately) forces the Rope Wrench to quickly engage or disengage. This responsiveness optimizes your climbing experience. It can also be used with a soft tether made from accessory cord or webbing (not included).