The retractable Tefal Ice Force knife sharpener with a 3-slot design is an essential kitchen tool that allows you to easily sharpen and repair stainless steel knives for optimal cutting results. Start with Slot 1, where diamond rods sharpen and align the blades to reshape the cutting edge. Then move on to Slot 2, where a Japanese grinding wheel straightens and polishes the blades. Slot 3 is the final step, where ceramic rods remove any remaining burrs. This user-friendly design features a non-slip base for safe, stable use and a retractable cover for space-saving storage in the kitchen.