The DMT DuoSharp Plus extra fine/extra extra fine is a high-quality diamond sharpening stone to sharpen your knives, scissors and tools to razor-sharpness. The surface of the stones remains e, so you'll always be using a flat stone. Your results are therefore always consistent and optimal. The stone is enhanced with an extra fine and an extra extra fine side. A part of the stone is completely comprised of the diamond layer (without the characterizing DMT dots). This part is meant for use with small and pointy tools or knives.