Interchangeable KnitPro needle cable with threaded fastening system available in various lengths (select from the dropdown menu). The package includes a small fastening key to tighten the connector between the cable and needles. It also contains two screw caps to keep your work in progress secure. Replace the tips with these plastic caps to prevent stitches from slipping off and the work from unraveling. Combine the different cable lengths with the wide variety of sizes of interchangeable circular needle tips to knit all types of projects. Use circular needles to work both flat and in the round, thanks to the resistance and flexibility of the cable.