#550 has good feedback, it cuts well ,especially on the super steels ,if you use guided sharpening systems and even by hand,i highly recommend these stones
Great belts I like them
Tungsten Carbide File Guide. Ideal for Knifemakers, fabricators, fitter & turners and machinists. Easy to use and suits all skill levels. For exceptional accuracy and precision when grinding and filing straight and flat edges. Internal width between bolts is 85mm.
This file guide will help you reliably complete your project with efficiency, accuracy and superior functionality.
Engineered and assembled here in Australia