Interchangeable Cords

From Knitter's Pride:

• Resilient, flexible cords lay flat, with no kink or twist – easy to store
• Smooth join – enables stitches to slide around needles effortless
• Long threaded screw-in “join” insures that cord and needles stay connected
• Tightening hole provided in the metal join for extra secure tightening
• Specially designed “key” facilitates effortless tightening
• End caps easily fit on cord and keeps knitting safe