The Singing Tree Rope Wrench ZK-2 (STRW) is one of the most popular tools used by arborists when they work using single rope technique. The STRW adds friction by creating a ‘bend’ in the rope, above the climber’s friction hitch. With the addition of a stiff tether, the STRW created a 'contained double rope system', on a single line of rope. This contained double rope system travels with the climber as they move around the tree, allowing a consistent level of friction on the hitch, which is often impossible to achieve in double rope climbing. The stiff tether is professionally spliced by the experts from At Height. It features a stiff rubber bumper to prevent the STRW from going into 'neutral' and is made of 8mm Beeline cordage wrapped in several layers of adhesive shrink tube. The tether has an overall length of twelve inches. The RP281 pulley from ISC was designed specifically for the Rope Wrench system. It has swivelling side plates and , a bushing wheel, and weighs only 2.7 ounces.

A Hitch cord and carabiner are required to complete setup. The quick release pin on the wrench and swivelling side plates on the pulley allow for quick attachment and removal. The body and wheel of both the pulley and wrench are made of aluminum with an anodized finish. Compatible with rope 7/16" - 1/2" in diameter. Kit includes the Rope Wrench, At Height stiff tether, and ISC RP281 micro pulley.

Date First Available: May 3, 2016. Best Sellers Rank: #96,521 in Sports & Outdoors. Customer Reviews: 4.5 out of 5 stars 88 ratings 4.5 out of 5 stars. : B01F44T1AQ. Part Number: ?RP280. Manufacturer: ?ISC Wales. Color: ?Gold. Brand Name: ?ISC Wales. Package Weight: ?0.36 Kilograms. Item Package Dimensions L x W x H: ?9.7 x 7 x 1.7 inches.