Probably The greatest firms in China for high-precision CNC turning is Celerity Precision. In this Highly developed production system, a slicing tool moves speedily about a workpiece for making complex cylindrical designs. We can make areas like shafts, pins, connectors, and fittings with fantastic concentricity, tight tolerances, and easy surfaces https://www.celerityprecision.com/en/capabilities/cnc-turning/