The 1x6" Naniwa Chosera 1K Grit stone is one of the most versatile and essential stones on the market. It is a keystone grit used for initial maintenance and light repairs on your edges, as well as for lighter profiling. It leaves a standard and functional work sharp edge that is acceptable for almost any knife or tool. 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.
1" x 6" x 5mm in size and mounted to a steel blank, the 1K Chosera 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 1K 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 1K Chosera stone works on steels between RC 52 and RC 65 on the Rockwell C Hardness scale. 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., this stone easily maintains and sharpens, leaving a respectable working edge, especially for kitchen use.
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 1K removes surface rust, reestablishes the bevel and edges and leaves a working sharp edge that is ready for use or more refinement.
On Carbide Forming Steel and More Abrasion Resistant Steel Edges such as VG-10, D2, M2, S35V, S90V, etc., The 1K Chosera stone still removes matrix steel and carbides while removing and cleaning up diamond plate or belt sander scratches. Depending on the specific steel type, it may be a little slower going to get the deeper scratches out if there wasn’t a coarser grit stone preceding the 1K. The 1K is essential in prepping these kinds of steel for finer finishes and polishes. The 1K edge on these steels is aggressive, yet refined enough to be used as is, or to be further refined with stropping or finer grits stones.
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: Naniwa Chosera 800, Jende 1K SPK, Shapton 1K, Sigma Select II 1K, Suehiro Cerax 1K
Atlernative Econmical stones - King 1K, Naniwa 1K Chocolate Bar, Sigma 1K B, Sigma 1K Oribest, Suehiro 1K R,
Alternative Mid Level stones - Naniwa 1K Goken Pro, Jende 1K SF, Sigma Ceramic 1K Hard, Sigma 1K Soft