The 290 hybrid knife sharpener from Chef's Choice is an advanced angle-select sharpener that provides perfectly sharp edges for all of your knives. The knife sharpener sharpens traditional 20 degree European and American household knives, as well as 15 degree Asian style knives. It sharpens both straight edge and serrated knives and can also be used for sharpening light sport and pocket knives. The knife sharpener is a hybrid model that combines electric and manual sharpening for a perfectly sharp and arch shaped edge that is super sharp and durable. The 290 sharpener features an advanced CrissCross sharpening technology and 100% diamond abrasives in stages 1, 2, and 3. The ultra fine diamond abrasives in stage 3 ensure a perfectly sharp and polished edge.