Naniwa Chosera Ceramic Waterstone (Whetstone)
The NANIWA CHOSERA (super ceramic) series feature their high grinding power, which enables quick sharpening even of materials that are difficult to sharpen with ordinary grinding stones, such as blue paper steel, high speed steel R2/SG2, and VG10.
The bonding material is softened by water when your grinding, and the cutting edge of blade gets deposited one after another, so there is no clogging and the high grinding power allows efficient grinding without up-sliding.
The surface of the grinding stone can be wetted with water and used immediately. No need to soak the surface in water, saving time and effort in preparation. This man-made grinding wheel is top class in terms of usability, speed, and finish.