Side and base edge bevel multi tool that includes a file. This one tool is all you need to sharpen and bevel your edges. NOTE: 80 mm is the maximum length file or stone that will fit into this tool. 70- or 80-mm stones are recommended. Dial a precise side angle from 0 degree to 5 degrees and 0.5 to 1.0 degree on the base. Nine angles total. It is recommended that you set the edge bevels with the file and then replace the file with 70- or 80-mm diamond stones to maintain the sharpness; if you always use the metal file, you will wear away the edge. The blue 70-mm RaceWax stone or the yellow 80-mm Swix stone are good starters, a black RaceWax or red Swix are the next most used; add the whole set of grits if you are a racer. Bonus Benefit for this tool: If you don't know what base and side angles your ski/board are set to, this tool can help you find them. Before you start mark the metal edge with a sharpie, start the tool at the lowest angle and see if it removes the marking on your edge. Raise the angle step-wise and repeat until it removes the mark. That is your angle! Record the base/side angles for future reference. Detailed edge tuning instructions are located under Tuning Tips in the top menu. A how-to video for this tool is in production.