Natural whetstone, Iyo name, Karakawamurayama, small red star, 30-cut, #68 / 1,527g

Welcome to MJ Select. We are Japanese seller. We ship authentic items from Japan. Please enjoy shopping with peace of mind! -------------------------------------------- 【About Included Manuals】 If a manual is included, it will primarily be in Japanese. We recommend using image translation apps if needed. 【Voltage Compatibility】 When using electrical appliances, please note that they are designed for Japanese voltage specifications (90-110V), so if you use them with a different voltage, it may cause a malfunction. 【Plug Type】 Our products use Japanese plug types (A or B type). Please use a conversion adapter if necessary. 【Important Note on Transformers and Adapters】 A transformer adjusts voltage to match your device’s requirements. A conversion adapter only changes the plug shape and does not adjust voltage. Using only a conversion adapter without a transformer may result in damage to the product. 【Liability】 We are not responsible for malfunctions or damages caused by improper use, such as operating the product without a transformer. -------------------------------------------- 78 x 206 x 30 mm 1,527g Hard, sticky, fine, medium-sized grinding wheel, semi-finishing grade, with holes for splitting stones, sorry It is hand-cut and forged into a plate. It is the best solution for changing the cross-sectional shape of high speed steel. Mining is done with heavy machinery, cutting is done with diamond cutting machines, and we are not involved with the "Iyo Meito" whetstones because they are counterfeit products with unauthorized branding. Since around 2007, we have been the only ones making "Iyo Meito". For this reason, all names except for Kokoppa are handwritten. We cannot answer inquiries about "Iyo Meito" that are not processed or manufactured by our company. Rough surface modified rhyolite and andesite from Iyo City, Ehime Prefecture, Japan, #1,000~5,000 grit, tends to be finer as it gets harder. Strongest retention of tenacity relative to hardness. Neutral and rust resistant unlike other Iyo whetstones. Grinding ability recovers well when raised with diamond #400 or less. Recommended by Kyonagura. Round bottom continuous striations ensure long lasting cutting at about 70% threshold, and with artificial whetstone grain ratio it is difficult to achieve a dull mirror finish, making it easy to bring out the contrast of the forge weld, material and carbon content differences. The blacker the rock, the harder and finer the stone tends to be. The harder the stone, the less sharp it is, so you should sharpen it by repeating the process each time depending on your purpose and level of skill. Natural whetstones from Iyo Province are said to have been circulating throughout the Setouchi region since the Kofun period, and the region is renowned as a leader in the fine whetstone industry, being one of the oldest and largest igneous rock systems in the world, said to be over 1,500 years old. Our country's fine whetstone resources were so valuable that they could completely change the nation and the people. The fact that the country's unique iron sand metallurgy, which had a very low yield due to a shortage of iron ore, and its location as a remote island in the Far East meant that it was a latecomer, were fatal conditions for the creation of an iron civilization, like losing a limb. Considering the history and tradition, it is clear that consumables that can be used to process harder and tougher iron products as desired are the source of Japan's famous whetstones. Until the 19th century, the performance of natural whetstones dominated the development of ironware. Despite its poor location for construction, it is both the oldest and largest wooden structure in the world. The Japanese sword is the product of superb ironworking techniques. For 700 years, the age of samurai, who risked their lives for a single swing of the sword, continued. Despite being a latecomer to the frontier, Japan had already invented some of the world's finest iron products during the Middle Ages, and today it is known as a manufacturing nation. The Age of Iron lasted from prehistoric times to the middle of the Heisei era. In other words, the power to produce iron was the very medium that spun not only the manufacturing process but also the culture and maturity of the nation. These fine whetstones, which are hard to replace, precious, unique and authentic, have overcome the many adversities that have befallen iron. If we measure Japan's various resources using modern values, when oil and atomic energy had no value, we can say that we are a resource-rich nation. The strength that can only be gained in the process of pushing back against scarcity and limitations is what gives depth and soul to history and tradition.