Commercial grade sharpener from Victorinox provides a razor sharp edge quickly with extreme precision on cutlery, knives, scissors and tools. The ergonomic handle fits left or right hand comfortably and securely. Full length finger guard protects fingers while sharpening. Easy to use, simply pull it over the cutting edge of your kitchen knife or multi-tool blade 2 to 4 times with some pressure, then pull it over the cutting edge 4 to 6 more times with light pressure to smooth the edge. This manual sharpener has lasting durability. The sharpening plates are at the perfect angle to bring your blade back up to its original sharpness. To double the life of your sharpener, simply turn the hard plates. Dishwasher safe.