Feature: 1. Various Sizes: Comes with 9pcs collet in different sizes, which will satisfy your varied working needs. 2. Extension Rod: 1pc extension rod is also included, ensuring higher accuracy and better safety for work. 3. Efficient Use: Firm holding will largely enhance working stability as well as efficiency, very useful. 4. Good Material: Forged with high quality carbon steel material, not likely to deform and very durable. 5. Easy to Install: This set has 1pc ER25 wrench, making the installation much more convenient to finish. Specification: Item Type: Collet Extension Rod Product Material: Carbon Steel CNC Tool Collet Model: ER25-3; ER25-4; ER25-5; ER25-6; ER25-8; ER25-10; ER25-12; ER25-14; ER25-16 Material of CNC Tool Collet: Carbon Steel ER25 Wrench Size: Approx. 5 x 30 x 190mm / 0.2 x 1.18 x 7.48in. Package List: 1 x MTA2-ER25-M10 Extension Rod1 x ER25-3 Collet1 x ER25-4 Collet1 x ER25-5 Collet1 x ER25-6 Collet1 x ER25-8 Collet1 x ER25-10 Collet1 x ER25-12 Collet1 x ER25-14 Collet1 x ER25-16 Collet1 x ER25 Wrench Note: 1. Make sure that the size of the collet and the extension rod must be the same.2. Due to manual measurement, please allow a difference of 1‑3 mm.3. When the tool is inserted into the inner hole of the collet, it must exceed the effective holding length of the inner hole to avoid improper damage.