104-Super Hardened Steel Special Lathe High Standard MGMN MRMN Steel Parts Grooving Knife BladeMGMN MRMN Steel Parts Grooving Knife 1. Made of imported technology, it has stronger hardness, sharper cutting edge and longer life 2. High quality matrix sintered at high temperature, making the blade sharp and wear resistant, and not easy to break 3. Life performance improved by 70% The upgraded anti breakage and wear resistant blade can process more workpieces than ordinary blades on the market, and the performance is almost the same as that of