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Features: Size: Diamond Steel 12 Inch Material: Diamond steel has Stable handle. Advantage: Sharpening steel is designed to ensure higher sharpening efficiency.The surface coating is very fine diamond particles. Product Usage: Diamond is the hardest material in nature, so it can be used to sharpen all kinds of hard material tools that are not suitable for other sharpening materials, such as ceramics, hardalloys, and so on. Using Tips: Knife sharpener will keep stable when sharpening.The angle between the sharpening rod and the knife should not be too large, keep at about 20 degree angle.