Mechanical lifting screw jack precision grinding sleeve with high hardness, high compression resistance, no deformation, can easily lift the core functional components. Analysis of each "part" has a big head. Although the body shape is small, it can lift a thousand gold balls. Grinding cast iron is integrated to ensure the stability and wear resistance of the top structure. The internal components are refined and refined beyond the surface. The compression resistance, no deformation, stability, and high hardness are guaranteed