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You can quickly and satisfying blades with hardened steel (such as Blue Paper No. 2), which was difficult to sharpen with conventional artificial whetstones. The highest quality whetstone that exceeds the limits of artificial whetstones and achieves exceptional sharpness. The grinding fluid (water) softens the binding agent and releases the cutting blade to the surface of the whetstone, so it won't clog or crush and has a high level of grinding power and an efficient grinding without grinding. Wide grinding surface with base for more stable sharpening