EZ Tye Fly Holder / Knot ToolStone Creek EZ TY Knot Tool The Stone Creek EZ TY Knot Tool makes tying flies onto your leader faster and easier by securely holding the bend of the hook while you tie your knot. Acting like a temporary handle for the fly, it provides better control when tying on small flies, especially in cold weather or low light conditions. The extendable wire grip holds the hook securely at the bend and retracts to keep the fly firmly in place while tying cinch