TWIST cables are memory-free! They consist of a multi-strand, steel cable coated with red nylon. This 37" length will make a 47"  circular when 5" (13 cm) tips are attached. Lifeline holes can be found at each end of these cables. Insert the T-shaped tightening key into the lifeline hole to assist with securing your tip/cable connection. For sizes US9 (5.5 mm) to US15 (10 mm)