16" and 24" cords for use with the Knitter's Pride Tunisian crochet hooks. Resilient, flexible cords lay flat, with no kink or twist easy to store. Smooth join enables stitches to slide around your hook effortlessly. Long threaded screw-in join insures that cord and hook stay connected. Tightening hole provided in the metal join for extra secure tightening and specially designed key facilitates effortless tightening.