This imparted drag above a cordage friction hitch opens new and exciting possibilities for climbers. Adding the Rope Wrench gives climbers all the advantages of stationary rope work posi-tioning with the safety and feel of more traditional systems The Rope Wrench accommodates only arborist-grade climb-ing lines (11–13 mm) interacting with spliced, heat-resistant,eye-to-eye Prusik cord (8–10 mm). It requires a micropulley/carabiner attachment to the saddle. A 1:1 climbing system in your future? The Rope Wrench is an excellent choice for safe, efficient stationary rope climbing WARNING: This product requires experience and possibly train-ing in rope-assisted climbing techniques (specifically SRS as de-scribed above) and tree-related hazard assessment prior to use. Model: ZK-2 (patent pending) Rope Size: 7/16" to 1/2" (11mm to 13mm) Material: Aluminum Source: Wales, UK Weight: 4.5 oz (127g) Width: 1.5" (38mm) Length: 4" (102mm) Height: 2" (51mm)