Extra-coarse diamond grindstone, grade #100. 100mm with a new larger grinding surface. This grindstone is used to bevel and tune the edges of alpine skis and snowboards. It 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. Diamond file For snowboard and alpine skis Extra-coarse grit (#100) for aggressive sharpening Larger 100mm surface for efficient grinding Perfect for tuning factory-set edges