Kumamoto Prefecture Natural Amakusa Whetstone Natural Medium Grit Stone, High Quality Dimensions: Length 195mm, Width 60mm, Thickness 40mm Weight: 1100g Grit: Medium grit (800#↑) This is a carefully selected piece of high-quality Amakusa whetstone from a large collection of finished products. Uses: Medium sharpening for Japanese knives and knives Available for immediate purchase.