A great alternative to a traditional sharpening steel this manual knife sharpener has high quality diamond and ceramic blades to ensure you achieve the best results possible. The two stage sharpening will help you to get a razor sharp blade enhancing your knives performance. Note: Not suitable for serrated knives or dishwashers.Product featuresDimensions 66(H)x 50(W)mmMaterial Diamond/CeramicRockwell hardness rating Carbide: HRA90 Ceramic: HRA92Diamond and cermanic blades to give razor sharp edgeUnique sharpening wheelNon-slip rubber feetTwo stage sharpeningHandwashing recommendedStage 1: Coarse sharpening to suit dull knives. Stage 2: Fine honing a necessary step used to eliminate burrs on the knife to give the perfect edgeErgonomic handle for comfort and control