This silicon carbide water stone is liked for its extremely high removal rate. The combination of 100Grit and 220Grit makes knife and tool sharpening and notch removal quick and easy. Features include removing substantial amounts of metal, restoring damaged edges of tools, changing bevels on blades, use effectively on stainless steel and carbon steel. Put into water for about 3 minutes before use and sharpen your knife or any other tool with enough water inside. These tools are ideal for carpenters, farmers, mechanics, professional craftsman and the home handyman. 200 x 50 x 25mm (8” x 2” x 1”). Made in Japan. Boxed.