Tungsten Carbide Burr, 3/8" Tree Pointed (SG-3) with 1/4" Shank. Max RPM: 70,000. Shank mounted tungsten carbide burrs are double cut for fine work. Designed for use on ferrous metals, plastic, fiberglass and other machinable materials. Great for deburring, sculpting and removing material in hard-to-reach areas. Designed for use with high speed die grinders like Forney 01993.