Circular needles allow you to knit 'tube' projects in the round such as socks, cowls, hats - anything you fancy really! 60cm. Addi metal circular knitting needles are the most often-used length for jumpers - use them for any project that's at least 60cm. circumference. Use them for flat knitting too: at the end of each row, just switch the needles around as you would with normal straight needles. Your project sits in your lap as you work, instead of hanging off the needles; when knitting a large heavy project, your arms will thank you for this! Addi is rightly renowned world-wide for excellent-quality knitting needles. Made by knitters, for knitters, they are smooth, fast and designed with your needs in mind. Addi Please note that the options given represent the length from needle tip to tip and not the cable itself.