Lanboshi #2000/#5000 Knife SharpenerLanboshi Germany Whetstone is constructed with premium grade corundum for taking good care of your be loved blades and being trusted by many for years, from commercial kitchens to knife enthusiasts. It works great with either water or oil and suits for knivies, as well as chisels, gouges, bits etc. Instruction (for getting the best result): Soak the stone in the water for 5 minutes, and then put it on a steady platform. Step 1: #2000 grit fine