The distribution of diamond particles enables the diamond needle file to not only cut in all directions but also produce a much better finish. Therefore diamond needle files can offer a fantastic abrasive for a variety of applications.
Due to the hardness of diamond, diamond files can be used on a variety of materials that other abrasives will not have an impact upon.
When you're working in small intricate areas the diamond file will work on the pull stroke just as effectively as it does on the push stroke. So this may make it slightly easier in confined spaces. It also means in theory that it will cut twice as fast as a toothed file of the same grit because it's cutting on the pull as well as on the push stroke.