1、CEMENTED CARBIDE: The extension rod is forged by cemented carbide, hardening and quenching, can be used for powerful milling to improve efficiency. 2、GOOD PERFORMANCE: With fine workmanship, the extension rod has high concentricity and good stability, high rigidity and strong clamping force. 3、FOR DEEP HOLE WORK: The extension rod can bring the milling cutter into the deep hole slot for processing, and solve the problem of deep hole processing. 4、WIDE APPLICATION: Widely used in CNC lathe, machining center, tapping machine, drilling machine, milling machine and other equipments. 5、OTHER ACCESSORIES: Equipped with hex wrench and screws, the extension rod is easy to install and use to meet various processing requirements.