Lathe drill chuck self - tightening drill chuck self - locking drill chuck

About Product:1. High precision, High clamping, High reliability and stability. 2. The Quenching treatment of vulnerable parts. (3) With self - tightening the function and the bit can be clamped gently, And the clamping force can be increased synchronously with the increase of torque in the drilling process, and the apparent high-strength clamping force can be generated. So as to prevent the bit from slipping.