The ISC Singing Tree Rope Wrench has become a well established, popular tool within the production climbing industry and in tree cimbing competitions.The Rope Wrench provides an 'S' bend in the rope above the hitch cord. This effectively provides a contained double rope system, on a single rope, which shares the user's weight between the Wrench and the hitch. This allows the operation of the hitch, without the need for a double-rope system. The Rope Wrench allows easy horizontally movement, with greatly reduced friction on re-directs (compared with DdRT).Technical InformationRope diameter range (mm) 11 - 13mm (7/16 - 1/2")Pulley wheel colour GreyWheel material AluminiumFinish AnodisedColour RedWeight (grams) 128Weight (ounces) 701