The DMT Dia-Flat™ Lapping Plate will flatten most sharpening stones, waterstones, oilstones or Arkansas stones. It is a combination of supreme flatness and DMT’s proprietary Diamond Hardcoat Technology™. It is a significant leap forward in durability and it will outlast any other diamond coating on the market. This is critical because the flattening process puts a tremendous amount of wear on stones compared with sharpening. DMT individually inspect EVERY Lapping Plate to make sure it meets strict specifications. Each plate includes a certificate for flatness, guaranteed to be less than ±0.0127mm across its surface. Over 30 carats of diamond grit give you a consistent, aggressive, 120 micron/120 mesh. The grit cuts fast and produces excellent results. The weight and extra large surface area keep it on your stone and make it easy to use. Size 254 x 102 x 10mm.