"FORNEY" CYLINDRICAL CARBIDE BURR (SA3) *3/8" *1/4" shank mounted tungsten carbide burr *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 places *Used with high speed die grinders *Rated 70000 RPM *Discovery ACC