The 1x6 Naniwa Chosera 800 Grit stone is a coarse stone used for initial maintenance and light repairs on your edges, as well as for lighter profiling. More of a "coarse 1K", it has more aggression than most 1K stones yet leaves a basic and functional work sharp edge with a little extra tooth. This stone also cleans up deeper factory scratches, makes transitioning from diamond plates and stones easier and cleaner, and is a good foundation stone before progressing to finer grits.
The 800 Chosera is 1" x6" x 5mm in size and mounted to a steel blank. This stone is used with water only and works best when soaked in water for a minute or two before use. Store in a dry place in between use.
Abrasive: Aluminum Oxide
Ideal place in a sharpening progression:
The 800 Grit Naniwa Chosera sharpening stone is a premium sharpening stone that works on almost all types of knives, scissors, tools and chisels, including those made with abrasion resistant steels. Even though the 1x6 size is meant for use with the Edge Pro, Hapstone and TSProf sharpeners, it is also a great size for a slip stone, field stone or a pocket stone for knife sharpening on the go, or to remove unwanted burrs.
On More Traditional Carbon Steel and Stainless Steel Edges, the 800 Chosera stone works on steels between RC 52 and RC 65 on the Rockwell C Hardness scale. It excels on softer end steels such as X50CrMoV15, AUS6, 440B, and most stainless steels used by many kitchen knife makers like Henckels, Wüsthof, Gunter Wilhelm, F Dick, Victorinox, etc. The solid stone matrix and aggressive 800 grit makes quick work of establishing an edge and preparing it for further refinement or leaving a basic working sharp edge.
On the higher end of the hardness spectrum of traditional steel edges made with steels like 1095, 52100, 440C, Aogami White, Shirogami Blue, O1, W1, etc. The Chosera 800 removes any surface rust, reestablishes the bevel and edges leaving an even and consistent finish. The slightly harder makeup of this stone allows for more pressure to be used in order to get some work done without the worry of the stone dishing so fast.
On Carbide Forming Steel and More Abrasion Resistant Steel Edges such as VG-10, D2, M2, S35V, S90V,etc., The Chosera 800 stone still removes matrix steel and carbides without much problem and is best utilized for removing and cleaning up diamond plate or belt sander scratches to prep the edge for a more even surface before going to finer grits. The edge this stone leaves a lot of tooth in the edge that can be used as is or stropped to give a little extra kick to that aggressiveness.
Hacks and Tips:
The Choseras are waterstones, and are not to be used with oil, but can be used in conjunction with oil stones (such as Norton India and other carborundum and Arkansas stones) if the blade is wiped clean before and after switching stone types. They can also be used in a mix and match progression with other synthetic and natural sharpening stones, as well with other brands such as Shapton, Sigma, Suehiro, Imanishi, Spyderco, King, etc. Naniwa Chosera is the original name of this stone line, and is now rebranded as Naniwa Professional Stones.
Comparable stones by grit:
King 800, Jende 1K SF, Jende 1K SPK, King 1K, Naniwa 1K Chocolate Bar, Naniwa 1K Goken Pro, Naniwa Chosera 1K, Shapton 1K, Sigma 1K B, Sigma 1K Oribest, Sigma Ceramic 1K Hard, Sigma 1K Soft, Sigma Select II 1K, Suehiro 1K R, Suehiro Cerax 1K