Champion Cutting Tool SE51 Tin Coated Miniature Bur, Oval Shape Solid Carbide, 1/4-Inch Cutter Diameter 3/8-Inch Cutter Diameter Oval Shape Use for contouring 1/8-Inch Shank 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