Traditional Japanese Blade Sharpening Whetstone 500/800 Grit - Water Only - no Oil Needed This traditional Japanese method is ideal for and finishing blades to razor-sharp edges 500 Grit (Rough Grinding) Return edges to their original shape (Darker Side) 800 Grit (Fine Finishing) Smooth and polish cutting edges (Lighter Side) Double sided stone DOES NOT require pre-soak (just add water), Dimension: 7 7/8 x 1 7/8 x 7/8