Featuring a revolutionary diamond coating and a round “string-shape” blade design, this Music Nomad 150 Grit Nut File is designed to deliver smooth, precise cuts. With the ability to cut and polish slots simultaneously, this nut file doesn’t drift like common toothed files. The industrial-grade diamond coating cuts all common nut or saddle materials such a nylon, bone, graphite and TUSQ while an ergonomic handle provides total comfort and control of the cut. They work great for electric, acoustic and classical guitars and even 5 string basses.