The innovative and multiple patented DuoSharp sharpening stone is a precision flat double-sided sharpener with a diamond surface. The 20 cm DuoSharp sharpening stone is an excellent countertop or bench sharpener with a larger, wider diamond surface for sharpening many different edges. Coarse diamond (45 microns/325 mesh) to quickly fix a dull edge, and extra coarse diamond (60 microns/220 mesh) when a lot of material needs to be removed from damaged edges. Sharpening with diamonds is quick and easy. No greasy oils are required; sharpen dry or with water. Solid construction for years of consistent performance and reliable service. When caring for their tools, craftsmen, chefs, and other experts rely on the outstanding quality and immense versatility of DMT products.