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 degree or 25 degreeand optional to use, additional 15 degree and 17 degree 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.