1、OXIDATION RESISTANT MATERIAL: Made of excellent carbon steel, quenching and blackening of the surface, with strong oxidation resistant ability, high hardness, and long service life 2、WEAR RESISTANT AND STABLE: Firmly clamping round die, used for processing or correction of male threads, with good stability, not easy to break teeth, fast edge collapse, wear resistant, long service life 3、TIME SAVING: Round die wire allows quick and easy installation and removal, saving your time when switching between applications 4、SAFE AND ASSURED: Strict quality control and quality assurance, bring high safety factor, can rest assured to use 5、WIDE USES: This high accuracy round die chuck is widely used in tapping machine, drilling machine, milling machine, boring machine, pneumatic tools, etc.