Oval Shape Solid Carbide, 1/4-Inch Cutter Diameter 3/8-Inch Length of Cut Champion solid carbide Burs with Titanium Nitride coating are manufactured in the USA from C2 tungsten carbide. Completely machined ground for consistently high performance, Champion Burs feature double cut flutes. "Double cut" flutes reduce chips to small, easily dispoSEd particles, while providing better uSEr control for more accurate deburring.