Features： 1、Multifunctional Shank: The shank of collet chuck holder is longer, suitable for deep hole processing, reducing the choice of processing tools, reducing costs and improving efficiency. 2、Stable Performance: Collet chuck extension rod is quenched and hardened, and the outer diameter and ER inner cone are finely ground to eliminate unbalanced margin, which is conducive to stability in the cutting process 3、High Efficiency: Milling extension rod is forged from high quality carbide, hardened and hardened to resist deformation. Milling extension rod can be used for powerful turning to improve efficiency. 4、Easy to Operate: Milling cutter extension rod has finely ground bore, high concentricity and high stability. Slick thread, high rigidity, strong clamping force, easy to load and unload. 5、Widely Used: Milling extension rod is widely used in CNC lathes, machining centers, tapping machines, drilling machines, milling machines and other equipment operations. Specification： Item Type: Collet Chuck Holder Model: SL22 ERG16A 80 Material: Cemented Carbide Use: Widely used in CNC lathes, machining centers, tapping machines, drilling machines,  milling machines and other equipment operations Package List： 1 x Tapping Rod 1 x Plastic box