ChiaoGoo cable connectors are accessories for the "Twist" and "Spin" interchangeable needle sets. They allow you to connect two cords together to create a longer cord. These connectors work equally well with the red "Twist" cables as the nylon "Spin" cables. Be sure to get the correct size for the cables you wish to connect. Small connectors connect small cables for needles size US 2 (2.75mm) through US 8 (5mm), while large connectors connect large cables for needles size US 9 (5.5mm) through US 15 (10mm).