Base repair tool creates an absolutely flat ski base quickly and accurately. When your ski base is not flat it is either concave, making the edges grabby and unpredictable, or it is convex, making the skis wander unsafely. A magnetic strip collects steel particles preventing base damage. Ski bases change constantly from wear, humidity, and temperature. New skis from the factory are usually not flat. Use of the Ski Visions Base Flattener will give you the performance you have been looking for. This "home stonegrinder" not only cuts with the steel blade, it also structures bases w/ available interchangeable stone inserts. As you continue to tune you will use the stones to keep the bases flat and structured. Includes 6" steel blade, 5" medium stone insert, file brush, allen wrench, and instructions.