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-Respons 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 .