SKS Base-Side Bevel File Guide (Pocket-II) Edge Tuner A single tool to sharpen and bevel side & base edges. Works on all ski and snowboards. File included. Precise side angles at 1 & 2 degrees. Base angle at 1 degree. It is recommended that you set the edge bevels with the file and then replace the file with 70-mm diamond stones to maintain the sharpness.