Product Description: DUANCHA is a high-precision and high-efficiency radial stage difference forming external cylindrical grinder; Suitable for external cylindrical grinding of milling cutters, drill bits, and pre threading processes. Punch head, punch needle, precision and rough grinding for one-time molding, high smoothness. Heartbeat and good beating, suitable for slender processing, minimum 0.1mm, beating 3um, product outer diameter 3um.