Usage Tips:EASY TO USE KNIFE SHARPENER: This is the perfect knife sharpener for chefs knives, paring knives, serrated knives, filet knives, cleavers you name it. If you own a knife, you need this sharpener. GET A SHARP EDGE IN 10 SECONDS: A sharp blade makes it easier to get work done quickly and safely. The innovative Knife Sharpener lets you sharpen most blades in around ten seconds. TUNGSTEN CARBIDE SHARPENER: the sharpening blades are crafted from diamond-honed tungsten carbide, one of the hardest known materials. With it's unique design, the sharpening blades can be reversed doubling its life span. DEPENDABLE & LONG-LASTING CONSTRUCTION: Knife Sharpeners will not rust and can be cleaned easily with soap and water or in your dishwasher. SAFE, UNIQUE, ERGONOMIC HANDLE: Featuring a unique, ergonomic handle, it fits neatly in either hand to accommodate both right-handed and left-handed users. Includes a full-length guard that protects your fingers throughout the sharpening process.