The Edge Grip Basic Single Step Knife Sharpener is easy to use and is a great value. It features carbide sharpening blades that can be used for straight edge knives. Dull knives can be sharpened quickly wth three-four pulls.Edge gripsingle stepcarbide bladesfor straight edge kniveseasy to useWarning: Cancer and Reproductive Harm-www.p65warnings.ca.gov, Advertencia:Cancer y Dano Reproductivo-www.p65warnings.ca.gov