The Atoma Diamond Plate line is one of our most popular alternatives to water stones amongst our sharpening aficionados. This line consists of an aluminum base plate and a diamond impregnated sharpening pad. The diamonds are arranged on the pad in a dot pattern, allowing for a much more consistent and even scratch pattern on the knife edge. The diamond plates are an excellent alternative to powered devices such as grinding wheels or sanding belts, due to the reduced heat build-up. The 400 grit plate is one of the most popular for those looking to keep their water stones flat. The layout of the diamonds keeps the plate from sticking to the stone during the flattening process. They are also great for keeping your higher grit stones flat; Because of the finer grit, they will not leave gouges. Measures 210mm x 75mm.