Item Type: Milling Cutter Accessories <br>Extension Rod Material: Carbon steel <br>Extension Rod Diameter: 1/4in <br>ER16 Collet Diameter: Approx. 3.5mm / 0.14in, 6.5mm / 0.26in <br>ER16 Spanner Length: Approx. 12.5cm / 4.9in<br>1、Milling Cutter Accessories: The milling cutter accessory kit includes router bit extension rod, ER16 collets and mill holder spanner, etc. <br>2、For Trimming and Milling: Commonly used in milling machines and engraving machines, can be used for wood trimming, milling, etc. <br>3、Carbon Steel Extension Rod: The router bit extension rod is made of carbon steel, which is resistant to wear and deformation. <br>4、Extension Rod Function: The extension rod eliminates the risk of pulling the handle from the chuck and provides a complete cutting depth. <br>5、With 2Pcs Chucks: Contains 2 sizes of 3.5mm and 6.5mm ER16 collet chuck, suitable for different clamping scenarios.1. Please make sure that the ER chuck extension is installed correctly; please note that the extension handle must be firmly fixed; and the chuck nut and the extension rod must be tightened. <br>2. Due to manual measurement, please allow a difference of 1?3mm. <br>3. When processing materials, speed up slowly first, and then speed up processing after waiting for stability.1 x Extension Rod<p>1 x ER16 Spanner</p><p>1 x ER16-6.5&nbsp;Collet<br></p><p>1 x ER16-3.5&nbsp;Collet<br></p><p>3 x Storage Box<br></p>