Natural Arakura Stone from Wakayama Prefecture, Omura Stone, Kama Stone, Antique Dimensions: Length 150mm, Width 37mm, Thickness 36mm Weight: 411g Grain Size: Coarse Grinding Stone (400#↑) This is a natural Arakura stone from Wakayama Prefecture, Omura stone. This item was part of an old inventory that had been stored in a hardware store's warehouse. Unlike artificial grinding stones, it produces a lot of grinding mud, making it easy to sharpen, and it can reshape chipped blades in a short amount of time. Because it is a natural grinding stone, it has excellent water retention, so you can use it simply by applying water without soaking it. Uses: Reshaping deep rust and large blade chips, rough sharpening of blades.