It is the general term for reversible turning inserts and is a mainstream product in the field of modern metal cutting applications. Mainly used in metal turning, milling, cutting grooves, thread turning and other fields. According to the material, it can be divided into coated blades, metal ceramic blades, non-metal ceramic blades, hard alloy blades, superhard blades, etc. Its characteristics are high efficiency and high wear resistance, with processing efficiency more than 4 times higher than traditional welding blades and alloy blades. With the continuous advancement of coating technology, breakthroughs in key technologies for wear resistance and high temperature resistance will further improve efficiency and reduce processing costs.