Sharpen kitchen and sport knives to a razor-sharp edge fast and economically with the Presto® Ever Sharp® 2-stage electric knife sharpener. Sapphirite™ sharpening wheels grind a precisely angled edge then fine hone and polish the blade to a razor-sharp edge. Get professional results at home anytime on most any non-serrated blade. Sapphirite™ sharpening wheels are made of the same ultra-hard material used in professional sharpening shops. Precision blade guides hold the knife at the perfect angle for no-guess sharpening. Simply draw the knife through each slot a few times for a razor-sharp edge.