HiyaHiya KnitSaver Interchangeable Cable, Size 47/49″, with Small Lifeline Holes. These small cables are for use in conjunction with HiyaHiya interchangeable needles Size US 2-8, (2.75 – 5mm). KnitSaver cables with lifeline holes are a wonderful addition to the HiyaHiya interchangeable line. Lifelines are a great way to protect your stitches while knitting complicated lace patterns. Lace knitting can be one of the most challenging forms of knitting because of the difficulties you can have to unravel one or more rows. To keep your knitting from unraveling further than you want, often knitters insert lifelines. The small hole in the cable allows you to insert a lifeline very easily. Actual cable length is 40.5″ and the variation in length would depend on the length of your interchangeable tip you connect to the cable.