HiyaHiya single point adapters are accessories for HiyaHiya interchangeable knitting needle sets. They allow you to put your interchangeable needle tips together with the adapter and a stopper to create a single pointed knitting needle. The single adapters are just a pair of 3.5" adapter pieces. Use them with your own tips and stoppers to create straight knitting needles approximately 8" long. The adapter sets come with the 3.5" adapter pieces, 2" tip extender pieces, 3.5" tip extender pieces, and cute panda end stoppers. This allows you to make single pointed knitting needles of various lengths. Please be sure to order the correct size. Small adapters fit needle tips size US 2-8 (2.75mm-5mm), which large adapters fit needle tips size US 9-15 (5.5mm-10mm).