The all-new D-Sharp features four sharpening angles (17, 20, 25 and 30) in 600 grit diamond. It also has a fine 800 grit ceramic benchstone that can be used for polishing straight or serrated blades. Perfect as a Lansky System accessory, or as a stand-alone sharpening solution. Product Features 4 sharpening angles (17 , 20 , 25 , and 30 ) Ceramic Benchstone for fine polishing and serrations 600 grit medium diamond pull-through slots 800 grit ceramic serrated mini benchstone