Swix Medium Coarse File is specifically designed for ski and snowboard tuning for the beginner tuner from one of the finest file makers in the world. Steel edges on skis and boards are made of a harder metal than traditional hardware store files. You can't tune your edges with a file that is made with softer metal than your edges. You need a file like the Swix Medium Coarse File, which is specifically designed for tuning ski and board edges. Use one side of the file for one edge and the other side for the other edge. This way the file wears down evenly and will last longer.