The Chef's Choice Multi-Stage Compact Knife Sharpener is a precision machine designed to deliver unsurpassed sharpening and manufactured to last a long, long time. Each of the 2 sharpening stages uses orbiting 100 percent diamond abrasives and foolproof bi-level magnetic guides to hold the knife at a predetermined sharpening angle and control the amount of sharpening pressure. This creates a durable cutting edge that is razor-sharp and ultra-fine. The sharpener can be used on all straight-edged knives including kitchen, pocket, and fishing knives, and is safe for the most expensive cutlery. The sharpener is backed by a 1 year limited warranty.