This has been our most popular sharpening stone for many decades. Useful for every knife, plane iron, and chisel in your workshop or kitchen. Made from Corundum / Aluminum Oxide based materials which are pulverized and reformed to exacting standards. The Coarse / Fine (700 / 2000 grit) combination will quickly grind your worn edges back into shape and then give you a fine finished edge. For an even keener edge, follow up with a honing stone such as our 8000 Grit King Waterstone. 3 1/8″ X 5 3/8″ X 3/4″. Made in Germany.