Kinki Amibari (KA) Cord End Stoppers
Screw into one end of the cable to make a Flexi Single Point knitting needle by adding a tip at the other end, a Tunisian / Afghan crochet hook by adding a flexi hook at the other end or to prevent stitches sliding off when you are trying on a garment.
M1.8 - 2mm to 3.25mm
M2 - 3.5mm to 5mm
M4 - 5.5mm to 10mm