Nail knots aren't tested often, but when they are there is a lot on the line. It is worth getting it right with the Loon Ergo Knot Tool. Best to avoid spending all afternoon cursing and trying to find a substitute for a solid knot tool. The Ergo Knot Tool makes nail knots easy and comes with clear instructions on how they are to be tied.FeaturesErgonomic designQuickly ties nail knotsInstructions included