Elastic for Knee Ascent: PZ-D022HA00 Features: Elastic for KNEE ASCENT LOOP and KNEE ASCENT CLIP assemblies increases durability Attaches to the upper strap of the KNEE ASCENT assemblies and the upper hole of the CROLL rope clamp Elastic for KNEE ASCENT LOOP and KNEE ASCENT CLIP assemblies increases durability. It attaches to the upper strap of the KNEE ASCENT assemblies and the upper hole of the CROLL rope clamp.