Diamond Sharpener. Blue high-impact ABS frame with rubber non-slip base. Features: Adjustable blade guide; 4 quick snap angles (17°, 20°, 25°, 30°); lightweight aluminum sliders; 325 grit double sided diamond rods and finishing steels. Waterproof. Can sharpen both sides of the blade at one time. Ideal for boats and kitchen use. Quick and easy to use. Includes instructional DVD.