3-stage kitchen knife sharpener - for brilliant results every time. Prepare, sharpen, the Hone. This simple knife sharpening system quickly and effectively keeps your kitchen knives brilliantly sharp and restores dull knives to their former sharpness. Ergonomic and portable design - the Smart Sharp knife sharpener features a comfortable handle for maximum grip, suitable for both right-handed and left-handed users. Sturdy non-slip rubber base for ultimate stability and safety - any flat surface in your kitchen will do (no need to find a suitable clean surface, unlike knife sharpeners with suction cups) For use on - straight-edged steel kitchen knives and wide-toothed knives (bread knives), including high-end knives with hardened carbon steel blades. NOT FOR USE ON: ceramic knives, scissors or micro-serrated knives.