Ripple Fisher Knot Tensioner
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This is RippleFisher's original Knot tightener to put the final touches for your line system. The small and large size comes as a set and once you open the cap on the large size, you can stow away the small one inside. Both large and small have a rubber line stopper at the end to secure your line.
It not only functions as a knot tightener but also comes handy as a line breaker in an event of a snag.