Crescent/Nicholson File Cleaners The file card and brush is perfect for general cleaning of file teeth, removing fillings, dirt, rust, burrs, corrosion, and most buildups of foreign material on metal. The file card and brush unclog teeth on finer files, allowing the abrasive to properly each time. Its wood base construction offers durability and ease of grip, so you can work confidently over time. . Pack of 1