Features:1.The extension rod diameter and the other parts are precision ground to eliminate unbalance, increase safety when cutting2.The straight extension tool holder, the length of the tool holder is 150mm, suitable for deep hole processing, to solve the need of extending the processing depth3.100% brand new high quality CNC milling holder, original standard, strictly full tested to ensure the best quality before shipment, safe to use4.The straight shank colletis made of high‑quality chrome-molybdenum alloy steel materials, which has high strength, high reliability, sturdy, not easy to deform,use for a long time5.You can rest assured that the installation is very simple No need to modify, cut or drill, not easy to fall off Ideal for replacing old or worn ones bring you a whole new experience however, professional installation is recommendedSpecification:Item Type: Collet Chuck Holder Model: ER11A-150LMaterial: Chrome-molybdenum alloy steelOptional Chuck Rod Diameter: 8, 10, 12, 16, 20mmApplicable Chuck Model: ER11AShank Length: Approx. 150mm / 5.9inPackage List:1 x Collet Chuck Holder Extension RodNote:1. Due to manual measurement, there are slight errors, thank you for your understanding.2. The color of the product head is shipped randomly.3. Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.