SHELURE Fly Fishing Angler Accessories Knot Tying Tool (Golden) The Knot Tyer is praised by fishing experts for its simplicity and for the strength of its knots. It can be used to tie a number of different varieties of the knot. Unlike other knots that have only one turn holding The NAIL KNOT is the most affective way to tie any size monofilament to your line. It is a smooth and secure knot that easily passes in and out of the rod guides. The knot cannot become untied because the tag end of the line is secured by all turns of the knot.