<br><b>How to install collet nuts: </b> <br> 1. Put the chuck into the pressure cap and turn the clamping spring gently. When the eccentric part of the pressure cap is embedded with the clamping spring groove, push the clip with equal force along the arrow direction, and install the pressure cap. <br> 2. Install the clamping spring and chuck cover together on the chuck body or spindle. After wiping the cylindrical handle, insert it into the clamping hole and tighten the gland with a wrench until the tool is clamped.(note: avoid fastening uninstalled pressure cap tools to avoid damage to the clip spring) <br> 3. Loosen the gland with a wrench, remove the chuck or tool, and remove the tool.Push out the clip along the arrow.Then replace other springs as needed. <br> <br><b>Specification: </b> <br>Model: ER20 <br>Material: High quality spring steel <br>Upper Diameter: 28 mm <br>Bottom Diameter: 25 mm <br>Height: 34 mm <br>Run-Out Tolerance: 0.015MM (0.0006") <br>Gripping Range: 1/16"-1/2" <br> <br><b>Package include: </b> <br>14 pcs ER20 Collets <br>Gripping range: 1/16",3/32",1/8",5/32",3/16",7/32",1/4",9/32",5/16",11/32",3/8",13/32",7/16",1/2" <br> <br><b>Note:</b> <br>1. Please allow 1-2mm error due to manual measurement. Thanks for your understanding. <br>2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.<br>