Faithfull Replacement Diamond Whetstone for FAIDWKIT (Diamond Stone, Docking Station and storage wallet). The double-sided 8mm thick 70mm x 200mm metal stone is electroplated with monocrystalline diamond in two grits, 400G Coarse and 1000G Fine. Will sharpen carbon steel, HSS and tungsten carbide tools and may also be used to abrade glass, ceramic tiles and porcelain. Ideal for general purpose sharpening of knives, scissors, chisels, plane blades, cutting blades, TCT router bits and any tool that requires a sharp edge. Can be used dry or with water as a lubricant, no oils are necessary.