Chefs Choice Commercial Electric Diamond Hone Knife Sharpener. Features a powerful motor, precision angle guides and a sturdy compact design. Sharpens straight edge and serrated knives. Two stages create double bevel. Stage one sharpens by removing old edge and putting first bevel on both sides of the blade. Stage two hones by putting second bevel on both sides of blade, and polishing to razor sharpness. Detachable sharpening module removes easily for cleaning in sink or dishwasher.