R-N-R, Twin Loop Runners Twin loop runners are a multi-purpose tool. They may be used as anchor slings, hose grab tools, to secure smoke ejectors, as stirrups in personal ascending systems, to drag equipment, to secure ladders and as a tether between rescuer and victim. Hundreds of other possible uses. TL runners are fabricated of 1" (25 mm) 4,000 lb. (1,814 kg.) tubular nylon webbing. All runners are sewn with nylon thread. Weight will vary with length. Figure 1 oz. (28 g) per foot of finished length. Made in the U.S.A.