The Shun Leveling Stone is easy to use and will give your whetstone even longer life. Maintains your whetstone; restores the perfectly flat surface required for precision sharpening Faster, easier flattening; grooves in leveling stone help collect material removed from whetstone as you flatten Soak both whetstone and leveling stone in water before using; use whetstone and leveling stone only with water Instructions included Keep your Shun knives in razor-sharp condition with the Shun Combination Whetstone. This whetstone offers you two grits: a very fine 3000-grit side and an even finer 6000-grit side. This is the right choice for sharpening your Shun knives when they are not very dull. The 3000-grit side lets you put a keen edge on your Shun, then refine and finish it with the 6000-grit side.