Chef's Choice Sharpener. Electric Diamond Hone Three Stage Sharpener. Black housing. Step 1: Presharpen - Speeds sharpening process. Removes old edge and creates first Trizor angle. Step 2: Sharpen - Orbiting diamonds hone second Trizor angle. Step 3: Honing - Micro diamonds hone and polish third Trizor angle, creating the Trizor edge. Magnetic Bilevel guides allow you to sharpen a wider variety of kitchen, pocket and fillet knives. Never detempers your knife (USA)