If you have previously avoided sharpening household or outdoor knives yourself‎,‎ now is the time to think again‎:‎ The DUAL DIAMOND makes it really easy‎.‎ Even delicate commercial knives can be sharpened with high precision‎.‎First‎,‎ attach the vacuum suction cup foot on a smooth and stable surface‎.‎ You now have both hands free and can run your knife along the grinding wheels‎.‎The two wheels ‎- one for coarse and one for fine grinding ‎- are coated with diamond powder‎.‎ First you draw them through the coarse side and then through the fine side‎.‎ The grinding angle is fixed ‎- so it can go wrong‎.‎ It‘s that simple‎.‎