The Correct 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 groove. Along the 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 , use a wrench to tighten the pressure cap, until clip firmly the tool before use. (Note: Avoid fastening pressure cap that not installed tool, to avoid damage the clamp spring). 3. Use a wrench to loosen the pressure cap and took out the chuck or tool, remove the tool. Along the direction of the push out the clamp spring. Then according to need replace other clamp spring. Model Number:ER16 Spring Collet Application:CNC Milling Type 2:8mm Extension Rod Holder Brand new Model: ER16 (1mm, 2mm, 3mm, 4mm, 5mm,6mm, 7mm, 8mm, 9mm, 10mm) Accuracy: 0.008mm Applicable machine: CNC machine Hardened and precision ground. Big clamping force and wide clamping range. ER straight rod type collet extension handle, the handle body is relatively long, suitable for deep hole processing. Can reduce the use of tools, reduce costs, improve efficiency. The outer diameter of the rod and other parts of the rod can be eliminated by precision grinding, which can eliminate the unbalance and increase the stability of the cutting. High strength and hardness. Performance stability, high accuracy. Durable in use. Used in machining centers, general milling machines, CNC milling machine, engraving machine, high-speed machines, and other processing. colour:Black + silver Material:Spring steel Length: . 45mm Inner diameter: . 8mm Package Contents: 10 * ER16 Spring Collet 1 * Extension Rod Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.