Natural Sharpening Honing Stone Waterstone Knife Chisel Plane Blade Razor Sharpener (3XL) Professional size natural "Ocean Blue" Tsushima sharpening honing waterstone with a matching nagura (slurry) stone Used for honing and sharpening knives, chisels, gouges, razors, blades, planes; no pre-soaking required Hard, very dense, uniform consistency of ultra fine grit; longer life cutting edge; high dish resistance, long lifetime Quarried from a now closed underwater mine near South Tsushima Island, Japan; golden stamp of authenticity; very limited stock 9.0"x4.0"x1.4" (230x100x35mm) +/- 3%; ~5 lb (2.3 kg); grit ~12000 (ultra fine); silicone anti-slip pad