The Notch Flow Adjustable Rope Wrench has an adjustable concave stainless steel bollard which provides custom friction setting. Engineered and developed in collaboration w Kevin Bingham and officially licensed from Singing Tree, the Notch Flow Adjustable Rope Wrench revolutionizes your basic SRS setup of a wrench and tether. Evolving from the original ZK-1 construction utilizing a bollard, the Flow is unique because it's adjustable, giving you the freedom to customize the friction in your setup. The Flow provides an improved ultra-low drag ascent, saving you time and energy when you climb. Pair the Flow w the Fusion Tether to create the ultimate SRS setup. Fits rope diameter range 11mm-13mm (7/16—1/2 inch) Features a quick and efficient integration w Fusion Tether or alternative tethers, includes a stainless steel slic pin for mid line attachment of the climbing rope. Robust solid hot forged T6 7075 aluminum construction w rope friendly chamfered edges. MBS: Body: 5,400 lbs. (23kN)