Diameters ranging from 0.6mm to 6.0mm refer to the realm of micro-machining to small-diameter machining, a category essential for high-precision component manufacturing. For machining within this diameter range, high dimensional accuracy, surface roughness, and stable processing quality are indispensable. Typical machining methods primarily include cutting processes using specialized small-diameter tools (such as small-diameter drills, end mills, and automatic lathes). Furthermore, for machining difficult-to-cut materials and complex shapes, wire electrical discharge machining (EDM) and laser processing are also effective methods. Main applications span a wide range, including medical devices (catheters, endoscope components), electronic components (connector pins, probes), automotive parts (fuel injection nozzles), and precision machine parts (watch components, optical instrument components), contributing to the miniaturization and higher performance of products.