The Swix Diamond Disk Tuner allows you to sharpen dull or nicked metal ski/snowboard edges right on the slope. This small tool is easy to fit in your tune kit or in your pocket and can make all the difference when you hit rocks or tree stumps on your previous run and need that quick fix to get your edges back in perfect shape. The Swix Diamond Disk Tuner edges quickly and efficiently at 88 and 89 degrees. The diamond stone is replaceable.