General description DMT Diamond Whetstone 200mm is designed for kitchen use and honing smaller workshop tools. It features a large, wider diamond surface suitable for sharpening a variety of knives and edges. The product comes with a non-skid hardwood case and has tabs for permanent mounting molded into the stone's base. Technical specifications Dimensions: 200mm (8 in) Grades: Black: Extra Coarse Grade 220 (60 micron), Blue: Coarse Grade 325 (45 micron), Red: Fine Grade 600 (25 micron), Green: Extra Fine Grade 1200 (9 micron)