Description:  9Pcs ER25 Chuck Collet Spring Collet Set with Collet Chuck Holder for CNC Milling Lathe Tool.     Specification:  ER25 Collet:  Material: Spring Steel.  Upper Diameter: 28 mm.  Bottom Diameter: 25 mm.  Height: 34mm.  Collet Chuck Holder:  Shank Type: MT2 or MT3 or MT4 (optional).  Collet Type:  ER25.  Optional Type:  2- MT2-ER25 Collet Chuck Holder+9Pcs ER25 Collet.  3 - MT3-ER25 Collet Chuck Holder+9Pcs ER25 Collet.  4 - MT4-ER25 Collet Chuck Holder+9Pcs ER25 Collet.     Features:  1. High Accuracy and Ease of Operation.  2. Use high-quality Carbon steel, after heat treatment, has good flexibility and abrasion resistance.  3. The clamping force, high accuracy, good gripping stability.  4. Can be for gripping the drill, boring knifes, chisel, reamers and other tools.  5. Ground roughness is Ra0.4 Microns, plus overall fine polish.  6. Suitable For: Boring, milling, drilling, tapping, engraving, CNC, spindle machines, and other processing.  The correct methods of mounting the collet nut:  1. Put the chuck into the pressure cap, gently turn the clamp spring, when eccentric portion of the pressure cap recessed clamp spring notch. Along the arrow direction and use equal force to push clamp spring, can mount pressure cap.  2. Put the clamp spring and cap all together installed on the chuck body or spindle. Insert into the clamping hole after wipe the cylindrical shank, use a wrench to tighten the pressure cap, until clip firmly the tool before use.     Package Included:  9 x ER25 Collet.  1 x Collet Chuck Holder