Change your fly often and be more productive. Now the issue of threading a tiny fly in low-light conditions is solved. The Eye Tie has three magnetic slots to handle the most popular size flies. Insert the eye and slide the tippet down the funnel. You're done and back in the game. Comes with a split ring to attach to zinger or D-ring. 3 hook slots fit sizes: 4,6,8 - 10,12,14 - 16,18,20,22.