Straight shank collet chuck for drilling machine, carbide lathe extension rod 1、CEMENTED CARBIDE MATERIAL: Premium cemented carbide material makes the extension rod strong, wear resistant, and toughness, heat resistant, corrosion resistant, etc. 2、FINE WORKMANSHIP: Extension rod is quenched and hardened, and the outer diameter and ER inner cone are finely ground to eliminate the unbalance allowance, which is conducive to the stability in the cutting process. 3、WIDE APPLICATION: Widely used for CNC lathe, machining center, tapping machine, drilling machine, milling machine and other equipment. 4、EXCELLENT PERFORMANCE: The inner hole is finely ground, with premium concentricity and strong stability. Smoothly thread, premium rigidity, strong clamping force and convenient loading and unloading. 5、EASY STORING: Comes with a storage box that the extension rod can be well kept when not in use. Also for easy carrying.