Champion USC1 Contractor Series Bright Finish Burs Solid Carbide Cylinder Shape Radius End 1/4-Inch Cutter Diameter Cylinder Shape Radius End Cylinder Shape Radius End 1/4" Cutter Diameter Used in mold and pattern making, die sinking, tool making and maintenance, burs reach into small intricate areas Burring Cast Iron, steels, titanium, brass, bronze, copper