TWIST cables are memory-free! They consist of a multi-strand, steel cable coated with red nylon. This 30" (75 cm) length will make a 40" (100 cm) 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 US2 (2.75 mm) to US8 (5 mm)