1、WIDE USAGE: This collet chuck holder can be widely used in CNC lathes, machining centers, tapping machines, drilling machines, milling machines and other equipments. 2、LONG SHANK: The shank of the extension rod is long, suitable for deep hole processing, and can be used for powerful milling to improve efficiency. 3、HIGH HARDNESS: Forged from carbide, quenched and hardened, the collet chuck rod has high hardness, good strength and toughness, not easy to deform, wear and corrode. 4、HIGH STABILITY: The outer diameter and ER inner cone of the extension rod are finely ground to eliminate the unbalance allowance, with high concentricity and strong stability. 5、STRONG CLAMPING FORCE: The extension rod has high rigidity, strong clamping force, smoothly thread and convenient loading and unloading.