Lace knitting is one of the most challenging types of knitting because of the difficulties involved when you have to unravel one or more rows to fix a problem. To keep your knitting from unraveling further than you want, knitters often insert a lifeline into their projects. Although it is possible to insert a lifeline using a needle and thread or dental floss, an easier technique can be accomplished using your HiyaHiya Interchangeable cable with a lifeline hole. For more information about lifelines, please see our Knitting Tidbits page Fits HiyaHiya Interchangeable Needles size 9-15US/5.5-10mm. Cable color may vary. HiyaHiya interchangeable cables are used in conjunction with a set of HiyaHiya Interchangeable Tips to create your knitting needle. With 4" Tips: 9.5" cable makes a 16" needle 11.5" cable makes a 18" needle 17.5" cable makes a 24" needle 25.5" cable makes a 32" needle 33.5" cable makes a 40" needle 53.5" cable makes a 60" needle With 5" Tips: 9.5" cable makes a 18" needle 11.5" cable makes a 20" needle 17.5" cable makes a 26" needle 25.5" cable makes a 34" needle 33.5" cable makes a 42" needle 53.5" cable makes a 62" needle