The 3M™ Flexible Diamond Hand File 6210J includes micron-graded diamond mineral anchored to a rigid plastic file in a metal bond matrix with an open dot pattern. It's ideal for deburring and finishing non-ferrous metals, as well as stone, glass, and ceramic materials.The 3M Flexible Diamond Hand File 6210J was created to help operators gain instant access to the workpiece by incorporating a diamond material into a hand-held design. For those parts that may have hard-to-reach areas or edges that may be hard to access, a hand tool sometimes proves itself to be the best solution. The 3M Flexible Diamond Hand File 6210J includes all the desirable attributes operators have come to expect from 3M Flexible Diamond Products including sharp cutting action and responsive design with the user-friendliness of a hand tool. The plastic handle is rigid yet lightweight.