Dry-Cell Needle Knotting Machine (For Thick Yarn)YH-714 (uses 2 AAA batteries).For thick threads from No. 3 to No. 14!Set Harris and needle and switch on!You can easily tie the inner knot.With "re-tightening" function that can firmly tighten the line.[Battery life] Approximately 100 needles can be tied (alkali).[Compatible needles] Ise Nunn 9-15, Flatfish needles 10-14, etc.[Compatible thread] No. 3-14 (nylon thread, fluorocarbon thread)