This is a tool for tying the thread of a wound fly to prevent it from unraveling.You can make your fly more durable by finishing it with a whip finisher.Please rotate it back and forth 5 times before use.A magnet is attached to the grip end, which is convenient for pulling up the hook.The finisher part has been electrolytically polished. It improves the slippage of the thread, so you won&';t feel any stress when rotating or pulling out the finisher.A neodymium magnet is attached to the grip end. Very useful when picking up hooks.