Sharpener Roller 85-90°A professional file guide with ball bearings against the ski base. It comes with an 80 mm file and bevel the side edge from 90 to 85 degrees. Ergonomic design for better grip and stability. Fits all files and grindstones up to 6 mm thick. The file is easily attached with a screw. Ergonomic file guide with ball bearings used for sharpening steel edges on skis and snowboards. Easily adjustable between 85 and 90. Filing tool. With ball bearings.