The NX 100m is the spool to choose when you frequently need a specific diameter: for rigging hooks, regularly re-tying leaders, or preparing multiple lines before a fishing trip. Its slim 7mm by 65mm design stores neatly, and multiple spools can be clipped together. Diameter control to within ±0.005mm provides a consistent basis for choosing between safety and finesse. The 4X to 5X diameters offer more line for forceful drifts, while the 6X to 8X diameters are ideal for more delicate presentations.