Dimensions: 9" x 4" x 4". Non-slip base. Three stage sharpening system. 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. Boxed.