Very coarse diamond grindstone, grain #100. 100 mm. This grindstone is used to bevel and tune the edges of alpine skis and snowboards. This also removes hardened steel after the edge has hit stones or rocks. After the ski edge has been initially set in the production process at the factory, the tip and rear end have the same type of over-hardened surface, which is easily beveled using this grindstone. Features: Diamond file For snowboards and alpine skis Sharp and exact