The Work Sharp Benchstone Knife Sharpener is an Angle Guided, 3-sided abrasive sharpening system. Medium (320) Grit Diamond and Fine (600) Grit Diamond Plates quickly restore a sharp edge, while the Fine Grit Ceramic Stone creates an incredibly keen edge on any knife. Abrasives are user-replaceable. The innovative Pivot-Response system allows the abrasive to follow the curve of the blade – making manual sharpening faster, easier and more precise than ever. Sharpening Guides are interchangeable from 20° or 25°and optional to use, additional 15° and 17° Sharpening Guides Sold Separately. Sharpens pocket and outdoor knives of all types and can also be used on kitchen knives. Pivot-Response feature can be locked out to provide a rigid sharpening surface for a wide range of knife & tool sharpening applications. Anti-skid feet ensure a safe and stable process. No water or oil is required, making sharpening faster with less set up and clean up. Abrasives are user-replaceable to provide service ability over the life of the sharpener. Professional level bench-top knife sharpening made easy. Angle Guides and Pivot-Response™ sharpening base provide precision, consistency and a superior sharpening experience than other sharpening stone systems.