Knitpro interchangeable needles are not just for knitting in the round. They give great flexibility for all projects. Needle tips screw on to cables using a small pin to help loosen and tighten. Cables come with the pin and two caps which can be used to hold stitches on cable while you \’borrow\’ for another cast on… Resilient, flexible cables 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 cable 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 cable and keeps knitting safe Colour Coded Cables for all your Knit Pro interchangeable needle Tips. Now you can find the length you need at a glance! 40cm cables are yellow 50cm cables are blue 60cm cables are lime 80cm cables are orange 100cm cables are red