Dry-Cell Needle Knotting Machine (For Thin Yarn) YH-713 (uses 2 AAA batteries).For thin yarns from 0.1 to 6!Set Harris and needle and switch on!You can easily tie the inner knot.Even beginners who are not good at knotting needles can feel at ease.[Battery life] About 500 knots can be knotted (alkaline).[Compatible needles] Ise Nun 1-15, Sleeves 2-12, etc.[Compatible thread] 0.1 to 6 (nylon thread, fluorocarbon thread)