[Widely Applicable to Knives]: For sharpening Straight edge knives that can be blunted, damaged or poorly maintained. [New Life for Old Knives]: This knife sharpening tools has a groove system, which has the ability to repair and sharpen dull or damaged knife edges, while refining edges and removing any remaining burrs or rough spots, and finally the ceramic part Polish and grind edges for a pointy to extend the life of old knives [Safe & Effortless Sharpening]: The manual knife sharpener no-slip suction base design adds stability during sharpening. Easily sharpen dull old knives smooth and , saving you time and money on repurchasing knives. The removable kitchen sharpener is easy to sharpen and clean up with water [QUICK AND EASY TO USE]: Place sharpeners on a flat place, hold the handle of the sharpener with one hand, put the blunt knife into the handheld knife sharpener vertically, select the appropriate sharpening card slot, and then gently pull in the same direction 3-6 times A