1. Material DC53, high strength and high wear resistance; 2. The hardness of HRC 61 ~ 63 is balanced by deep cold treatment in super space; 3. The coaxiality is high, and the coaxiality of a single piece is ≤ 0.001mm; 4. The positioning accuracy is high, which is suitable for optical lens molds; 5. Convenient assembly and simple disassembly