Knitter's Pride Interchangeable Cords-Resilient, flexible cords that lay flat with no kink or twist-easy to store. Their smooth join enables stitches to slide around needles effortlessly. The long threaded screw-in join insures that the cord and needle stay connected. Tightening hole provided in the metal join allows extra secure tightening. Specially designed "key" facilitates effortless tightening. End caps easily fit on cord and keeps knitting safe.