Blade Length: about 135mm(5

maintaining its sharpness

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and pattern attachment

making it a plane that is confident in cutting hardwoods

"IYO HIGASHIYAMA", Tennen Toishi (Japanese Natural Whetstone), 1152g #150 Blade Length: about 135mm(5"IYO HIGASHIYAMA", Tennen Toishi (Japanese Natural Whetstone), 1152g Three HONMAMON Stars (link) While to selecting a Japanese Whetstone, you will see Japanese Natural Whetstone with 2 names on the stone. One name is Mountain Location, The best Natural stone always from Kyoto Higashimon area and Nishimon area. Higashimon area with Nakayama, Okudo, Syobu, Ozaki, Otsuki etc. Another side Nishimon area with Kameoka (Ohirayama), Hiterayama, Maruoyama etc.