Music Nomad’s Nut Files feature a diamond coating and round string-shape blade design resulting in smooth, precision cuts. The files can cut and polish slots at the same time. The industrial, even diamond coating cuts all-new or existing nut or saddle materials such as nylon, bone, graphite, and even metals such as brass and zinc. With 16 sizes to choose from, they work great for electric, acoustic and classical guitars and even five-string basses. They can be bought individually or in a six-piece set.