Faithfull Diamond Whetstone Sharpening Kit. 3 Stones: 400G Coarse, 600G Medium And 1000G Fine Includes Non Slip Base UnitThis three stone sharpening system is ideal for quick, easy and effortless sharpening of any blade. The 70mm x 200mm metal stones are electroplated with monocrystalline diamond in three grits, 400G Coarse, 600G Medium and 1000G Fine Ideal for general purpose sharpening of knives, scissors, chisels, plane blades, cutting blades, TCT router bits and any tool that requires a sharp edge Diamond stones will sharpen carbon steel, HSS and tungsten carbide