The 310 electric knife sharpener from Chef's Choice allows you to quickly apply extremely sharp double-bevel edges from the tip to the bolster. The sharpener has 2 stages with 100% diamond abrasives that ensure your knives are getting the best of the best. The diamond hone sharpener features advanced bi-level magnetic guides for easy and safe sharpening. The knife sharpener is to be used for 20 degree kitchen, household, sports and pocket knives (both serrated and straight edge).