McGowan's Firestone knife sharpeners make it easy to sharpen kitchen knives and utility knives. Made from a blend of aluminum silica and ceramic and diamond, our knife sharpeners provide the perfect sharpening surface. Both sides of your knife are sharpened simultaneously, creating a hollow ground edge. Knives have never been so sharp - and sharpening has never been so easy! Knives have never been so sharp - and sharpening has never been so easy! Fired Ceramic Stones . . . . Features powerful one-step precision sharpening. Sharpens both sides of the blade simultaneously at the correct angle with multiple diamond-enhanced ceramic counter-rotating wheels. Creates a burr-free, razor-sharp hollow ground edge for all kinds of knives - even electric, kitchen serrated and cleavers! The Fastest, Easiest and BEST sharpeners you'll ever own GUARANTEED! Warranted for 3 years - 100% satisfaction guaranteed. --- MADE IN THE U.S.A ---