A double-sided diamond sharpening-stone type file. Can be used to sharpen hard blades such as ceramic blades and ultra-hard metals. [Features]· Can be used to sharpen ceramic kitchen knives that were formerly impossible to sharpen as well as ultra-hard metals and other types of hard metal.· More resistant to abrasion than conventional grindstones so does not require correction of the grinding surface.· A 2-function type with 2 faces that can be used for different types of application.· Available in 2 types. A type with a rough sharpening surface (grit size: 150) and a medium finishing surface (grit size: 600) or a type with a rough sharpening surface (grit size: 400) and medium finishing surface (grit size: 1000).· Includes a non-slip mat. [Applications]· Can be used for sharpening blades from household kitchen knives to cemented carbide types.· Ideal for sharpening kitchen knives, drills, planers, etc.