The Naniwa Chosera series, crafted exclusively for the Japanese market, offers premium sharpening performance. Featuring a thicker design than the PRO line, this whetstone includes a Nagura flattening stone for enhanced sharpening efficiency. Built for professional-grade use. This is a polishing grit stone.Spoil yourself with Naniwas ultra fine polishing whetstone! Polish and refine your edge to extremely sharp levels, AFTER using a medium/coarse whetstone, then a polishing stone (3000 and or 5000). Recommend progression: 400 grit --> 1000 grit --> 5000 grit -->10,000 grit Care InstructionsUse the included Nagura (included) before/after use.Only a short soak in water in needed. Do not leave in water for extended periods.Flatten, clean and allow to air dry in a cool place. Allow to completely dry before storing. Nagura stone: The Nagura Stone is used to help maintain flatness of the surface. The Nagura also helps to make a slurry prior to sharpening, which speeds up the sharpening process.Leigh’s 2 cents: Massive, high-quality professional grade whetstones! Made to sharpen many knives.Get the sink bridge to match and/or a Atoma flattening plate Dimensions:Brand: Naniwa ナニワ研磨工業Origin: JapanLength: 210mmHeight: 25mmWidth: 70mmWeight: 1350g