The easiest gadget we’ve ever tested for threading flies onto your tippet. The magnetic notch firmly holds the eye in place, perfectly aligning it with the leader every time. 1 per pack So we thought this might be a little gimicky. And besides, how would you line the eye up every time? Well, we don't know how, but it always works. Just hold the fly anywhere near the magnet, and it lines up perfectly. So perfectly that we were threading thick mono through a small eye! EVERY fly fisher - even those with perfect eye sight - needs one of these.