... , Mold Etc.2) Super high hardness and precision, extreme smooth coating surface, can be coated by TIN, TIALN, ALTIN, TIAIN, etc ... -resistant application.5) Work piece material: cast iron, carbon steel, alloy steel, hardened steel, quenched steel, non-ferrous metals, etc.6 ... contact us. Any questions are highly welcome! tungsten carbide drill coating AIN