This Lightning fast professional home sharpener creates, in seconds, The novel tremor-plus edge which can be customized to suit each cutting task! It sharpens straight-edge and serrated knives and is so easy to use, anyone can put astonishingly sharp, long-lasting edges on knives in seconds. You can select extremely sharp hair-splitting edges that slide smoothly and effortlessly through delicate foods like smoked Salmon and prosciutto or alternately, edges with varying amounts of “bite” for more demanding jobs, like cutting tough fibrous foods and meats. 100% fine diamond-coated conical disks in stage 1 and stage 2 form the first and second bevels of a durable, arch-shaped edge. In stage 3, a revolutionary flexible stropping disk creates an Ultra sharp polished third bevel and cutting tip while polishing The first two bevels to form sharp cutting flutes that enhance the cutting action on both sides of the edge. Built-in high-precision elastomeric angle guides eliminate guesswork and ensure hair-splitting sharpness time after time. It’s ruggedly built and backed by a limited 3-year. The unit is compact approximately 10” long x 4” x 4”. resilient elastomer feet hold the unit securely to the work surface. The chef's choice diamond hone edge select plus model 120 requires no sharpening oils or liquids. Engineered and assembled in the USA.