The DMT Aligner ProKit is the system to own when you care about sharpening knives. The most difficult aspect of knife sharpening has always been finding and keeping the correct sharpening angle. The aligner system takes the guesswork out of sharpening by allowing you to select your sharpening angle and keep your stone and knife perfectly aligned for the sharpest edge possible. This system can be used by inexperienced sharpeners to get that professional edge, or used by more experienced sharpeners to save time and ensure the most accurate sharpening angle.Easy to store and carry container neatly holds all the Aligner componentsThree diamond stones-ExFine polish and refine, fine razor sharp edge, coarse transform a dull edge along with a fine serrated sharpener accessorySharpens knives faster than conventional stones with DMT’s micronized monocrystalline diamond surfaceNo oil is needed-sharpen dry or with waterDurable construction will provide years of performance and reliable serviceWARNING: use of this product can expose you to chemicals including nickel which is known to the State of California to cause cancer. For more information go to www.p65warnings.ca.gov.