3 Stages Electric Knife SharpenerSPECIFICATIONS Installation Method: Assembly 198H 3 Stages Professional Electric Knife Sharpener, Diamond Roll Sharpener for Razor Sharp Result, Low Noise Three Functional Slots: This SHARPAL Electric Knife Sharpener is designed with 3 stages to ensure a razor sharp edge on most double beveled straight edge and serrated knives. Simultaneous grinding of both blades saves much time and ensures that both blades are sharpened the same number of times. It