1、[Extension Rod] The extension bar can bring the milling cutter into the deep hole machining groove to solve your deep hole machining problems. 2、[High Concentricity] The bore of the extension bar is finely ground for high concentricity and stability, and can be used for powerful milling to improve efficiency. 3、[Cemented Carbide] The extension bar is forged from carbide, hardened and hardened, not easily deformed, and has a long service life. 4、[Wide Application] Extension bars are widely used in CNC lathes, machining centers, tapping machines, drilling machines, milling machines and other equipment operations. 5、[Smooth Thread] The extension rod has smooth threads, high rigidity, strong clamping force and easy loading and unloading.