1Internal External Grinding Process: The correction tool adopts the internal and external grinding process, which greatly improves the hardness and wear resistance. 2Precise Grinding Treatment: All the end faces of the knife calibration device are accuracy grinding treatment, which can ensure the overall accuracy of the tool holder, so as to ensure the accuracy of measurement. 3Production Inspection: This is a non corrosive calibration tool, with multiple production inspection procedures and quality assurance. 4Portable Design: The balance chuck is small in size, light in weight, easy to use and easy to operate, which brings you more convenience. 5Wide Applications: The chuck has a wide range of applications and can be used in drilling, grinding and lathe machining centers. Item Type: BalanceColletChuck Material: 20CrMnTi Accuracy: Approx. 0.005mm / 0.0002in Carburizing Depth:1 x CalibratorPlease use by professionals to prevent injury from operation