Chef'sChoice Diamond Hone Professional Knife Sharpener 320 is the perfect tool for high-quality European straight edge and serrated knives. Suitable for both right or left hand use, this sharpener has a diamond abrasive in Stage 2 to quickly sharpen your blade while protecting the blade edge. Engineered and assembled in the U.S.A., Chef'sChoice Diamond Hone Professional Knife Sharpener 320 offers fantastic results on quality European straight edge and serrated knives quickly, safely, and with ease.