2059-High precision side solid SLD extension rod CNC milling cutter extended rod small diameter straight handle deep cavity avoidance C12C16C20High precision side solid SLD extension rod CNC milling cutter extended rod 1. Taper design deep cavity processing The front end of the side mounting extension rod has a taper to reduce the interference of the workpiece during processing, and is suitable for a variety of deep hole and mold processing operations 2. The alloy material is quenched and hardened Carburizing first and then quenching, the surface is bright and the hardness is high, so that