Universal File Cleaner Carded LUTZ 10 USA FILE CLEANER - FILE CARD - LUTZ #10 FILE CLEANING BRUSH File card is made of wood and has hardened and tempered sharp steel wire bristles are set in a hardwood handle. Ideal for Machinists, Mechanics, Woodworkers and for anyone that uses a file in cutting, cleaning and roughing applications. File card is a file cleaner which is designed to remove small particles that clog teeth and reduce the files ability to cut properly. A bench tool necessity, a clean file will work best cleaning a file will extend the life of the file.