1、The surface is vacuum-nitrided processing with higher hardness and more wear resistance 2、High temperature quenching greatly improve the hardness wear resistance and toughness and achieve bright surface and small deformation 3、Made of high-speed steel durable and long service life 4、Suitable for various CNC turning and milling machines 5、Available in four styles for choices: SHB-12-03 SHB-12-04 SHB-12-05 HB-12-06