1、STRONG AND EFFICIENT: The extension rod is forged from excellent hard alloy, hardened, not easy to deform, can be used for strong milling to improve efficiency 2、STABLE AND PRACTICAL: The inner hole of the extension rod is finely ground, with high concentricity and strong stability. Smooth thread, high rigidity, strong clamping force, convenient loading and unloading 3、FOR HARD TO REACH AREAS: DC extension rod can bring the milling cutter into the deep hole machining groove for processing, solve the problem of deep hole machining for you 4、WIDE APPLICATION: Extension rod is widely used in CNC lathe, machining center, tapping machine, drilling machine, milling machine and other equipment operation 5、WITH FITTINGS: Equipped with 1 hex wrench and 1 storage box for easy installation, use, storage, and carrying