Micron sized monocrystalline diamonds are securely bonded in nickel that is electroplated to precision ground steel. An injection molded polycarbonate base increases the structural rigidity needed to maintain a flat sharpening surface.The innovative pattern of the recessed dots is key to the DMT difference. By providing a space into which metal fines produced from sharpening can be cleared, the dots keep the diamond surface clean for fast and efficient hone of all materials.Size: 2.75 X 1 X .25