Feature： Manufactured from alloy steel with good core strength and long wear life.The case hardness is designed to give maximum wear life without compromising the 60-62 HRC spindle. The core creates a damping effect from the vibration during the high speed milling, especially in long reach or heavy duty milling application. Taper ground to AT3 or better accuracy standard for maximum contact with spindle. All critical surface are precision ground. Concentricity is less than 0.0001" from taper to end mill pocket. Package Includes： 5pcs ERCollet Chuck CAT40 × ER32-2.76" 5/8"-11 .
