The perfect diamond knife sharpener for home use, chefs, fishermen, and hunters. The Patented V-Sharp system used in the A4 is the only free hand sharpener that sharpens a precise angle on both sides at the same time. This is the secret to getting a sharp and long lasting edge. It is easy to use and gives a perfect edge. The A4 will sharpen at 4 angles from 15 to 30 degrees on both smooth and serrated blades. 

The included hones will sharpen smooth blades only. To sharpen serrated blades use the ceramic hones sold separately.