This product is beautifully made and very versatile. It has 'fine' and 'coarse' sections and can also be used to sharpen scissors. The fine section is for daily use to maintain an edge after use, whereas the coarse section is for dull edges that haven't been sharpened for a long time. The manual states serrated edges can be sharpened in the fine section. It is very easy to use, produces excellent results, and the wonderful Wusthof workmanship and weight of the sharpener give it a high degree of 'pride of ownership'. Highly recommended