Natural "Ocean Blue" Tsushima sharpening honing waterstone whetstone Used for honing and sharpening knives, wood chisels, gouges, razors, blades, planes, fishing hooks 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 8.0"x2.7"x1.0" (200x70x25mm), 2.2 lb (1.1kg) +/- 5%; grit ~#10-12K (fine) Natural Sharpening Honing Pocket Stone Waterstone Hunting Knife Chisel Sharpener