Drill America DUL Series Carbide Burrs are designed for cleaning out material in a wide-range of products including wood, plastics, stainless steel and other metals such as nickel, iron, steel, tool steel and titanium. Also called die grinder bits, rotary burrs and rotray files. These solid carbide construction permits for longer tool life and faster cutting speeds. These double-cut burrs have rows of cutting teeth cut in two intersecting directions for fast material removal and a rougher finish. Drill America DUL Series Carbide Burrs come in a wide range of shapes and sizes. Shapes include ball, cone, flame, tree and cylindrical. Sizes range from 1/16" to 1" in diameter with round shanks.