Manufacturer's code: 820674 Japanese stone to sharpen Hendi by Naniwa, Used to sharpen knives. The sharpener is double-sided and combines two tiles with different grain (1000/3000). Graincontously 1000 is used to sharpen the blade base, while using a 3000 granularity page, we will march and finish the blade. Before use, you must go down the stone. For safe storage, a plastic container is included in the set. Product features: