Restore the precise factory edge of your Wüsthof straight-edge knives with the ease and speed of automatic sharpening. Wüsthof's own electric sharpener employs interlocking diamond-abrasive wheels to sharpen both sides of the blade at once for fast, foolproof results. The two slots offer coarse and fine sharpening, automatically positioning the knife at the optimal angle. 9 1/2" x 5 3/4" x 4 1/2" high.