Features: 1. Made of high-quality metal material not easy to rust and break long-term use strong and durable. 2. High precision and stable performance. Extend your router bits to provide full depth of cut for 1/4" shank router bits. 3. The collet provides the extra depth of cut required for many milling tasks. Easy to use better control it will increase your productivity. 4. Wide Range of Applications: It allows you to process products more efficiently suitable for woodworking trimming milling drilling engraving machine and other processing. 5. If you have any questions please contact us in time. We will provide you with better products and services. Notice: 1.Actual color may be slightly different from the image due to different monitor and light effect 2.Please allow 1-3cm deviation due to manual measurement Description: Material: spring steel Size: As shown includes: 1 set x Extension Chuck Rod "