Description: BT30-ER16-70 BT30-ER11-70 Collet Chuck Tool Holder for CNC Milling Lathe Tools.     Specification:  Material: 40cr.  Hardness: HRC45.  Accuracy: ≤0.01mm.  Draw bar thread: M12 x 1.75.  Effective length: 50mm.     Features:  -The handle has stable performance and long service life, after heat treatment has been greatly improved in hardness handle.  -Advanced production technology to ensure the accuracy of the handle, to meet your requirements in high precise machining.  -Chuck holder is stable using life, advanced vacuum quenching furnace to achieve carbon and nitrogen Co doped increase the hardness of the handle.  -The life rate is high, and the cost can be reduced.  Application: It's suitable for drilling, milling, engraving, high precision, widely used in precision machining.     Attention:  -CNC tool placement collet, must go beyond the collet hole effective clamping length.  -Use the correct wrench device, can not be arbitrarily changed so as not to cause damage.  -Do not use the rod with a notch or a plane of the CNC cutting tools.  Please note that the package includes 1pcs tool holder only.     Package Included:  1 x BT30 Collet Chuck Holder