Champion Cutting Tool SD4 Double Cut TiN Coated Carbide Bur Ball Shape. 7/16" Diameter x 3/8" Length of Cut. Standard 1/4" Shank Champion double cut carbide burs are Titanium Nitride (TiN) coated for superior surface finish and long life. Rotary carbide burs are for use in die grinder only. Champion carbide burs are precision macine ground using diamond wheels and automated machinery producing consistent geometry, sharp cutting edges, and vibration free performance Ideal for use on titanium, bronze, steel, stainless steel, cast iron and brass Used widely in the automotive, aerospace, foundry, power station, and engineering industries