The Swix T107X is a coarse bastard file specifically designed for the initial shaping and defining of ski and snowboard edges. Think of it as the sculptor's chisel for your metal edges, aggressively removing material to establish the precise angles needed for optimal performance. This file is particularly useful for professional ski technicians and racers who demand the most out of their equipment. Due to its aggressive nature, the T107X is best suited for those with a good understanding of ski tuning and the ability to precisely control the filing process. If you're a recreational skier who occasionally tunes your own skis, a less aggressive file might be a better option to avoid accidentally damaging your edges.