Router bit extension rod and collet chuck kit for woodworking trimming, milling, engraving machine. Made of high-quality carbon steel material, durable and sturdy. The extension rod can eliminate the dangerous of withdrawing the from the collet. And extending the router bit to provide the full depth of cut. Make you work better, , more efficient and more labor saving. BETTER SECURITY: The extension rod can eliminate the dangerous of withdrawing the from the collet and extend the bit to provide the full depth of cut. EASY TO USE: First put the collet into the cap, then insert the milling cutter into the collet from the top of the nut, and then put it into the rod together. Finally, rotate and fasten it with a wrench. WIDELY USE: It can make you more efficient to process products, suitable for woodworking trimming, milling, drilling,CNC, engraving machine and other processing. Model Number: Router Bit Extender Diameter: 1/4 inch Collet inside Diameter: 1/8inch, 6mm, 1/4inch, 8mm, 10mm Colour:silver Material:Carbon steel Package Contents: 1 x 1/4 Inch Router Collet Extension 1 x ER16 1/4inch Collets 1 x ER16 1/8inch Collets 1 x ER16 6mm Collets 1 x ER16 8mm Collets 1 x ER16 10mm Collets Tips: 1. Before using this tool, please measurement tool deflection, tool deflection accuracy exceeds 0.01mm, please correct before cutting. 2. The tool extends the length of the chuck as short as possible, the tool extends the amount of time , if extended, please cut their own speed, feed rate or cutting the amount. 3. If the cutting of abnormal vibration or sound, cut spindle speed and depth of cut to improve the situation so far. 4. are included, please keep from children under 3 years old. 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.