HiyaHiya interchangable cables are used in conjunction with a set of HiyaHiya Interchangable Tips to create your knitting needle. With 4" Tips: 9.5" cable makes a 16" 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 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 Fits needle tips size 9-15 US / 5.5-10 mm only