The Notch Flow Adjustable Rope Wrench has an adjustable concave stainless steel bollard which provides custom friction setting. Engineered and developed in collaboration with 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 with 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 with 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 with rope friendly chamfered edges. MBS: Body: 5,400 lbs. (23kN) Additional Features for Tether Combo include an adjustable bollard allowing custom friction setting, an incorporated Rope Wrench stop for optimal orientation and multiple SRS ascent attachment points and a secondary attachment point for an auxiliary climbing system.