Challenge for 10 seconds! For speed needles and fine threads (0.175-2 threads) You can tie an "outer hook knot" in about 10 seconds using the power of two magnets. We have received compliments from veteran anglers who prepare a lot of needles. For fine threads, nylon 0.2-0.4 can be tied without twisting or twisting, so it is ideal for tanago needles, mountain stream needles, spatula needles, and needles for small sea items.