Sharpens everything from very dull or damaged blades to already sharp blades in need of a quick touch up. Natural Arkansas and diamond stones. Interrupted surface on diamond stones speeds sharpening. Larger stones allow for use with small or large knives. Works on a variety of knives and tools. Easy to rotate and identify stones. Premium honing solution, sharpening instructions, and angle guide included. Trough in base to catch the excess lubricant. Non-skid, plastic base.