Feature: 1. [Enhanced Efficiency] The router collet chuck extension rod improves your work efficiency, allowing for better performance in your machining tasks. 2. [Long Lasting] Crafted from premium manganese steel, this extension rod undergoes surface quenching and blacking treatment, ensuring strong oxidation resistance, high hardness, and a long lifespan. 3. [Convenient Wrench] Equipped with an ER16A wrench, this milling tool extension rod enables easy and quick tool changes. Comes with a storage box for easy storage. 4. [Wide Application] This CNC milling tool holder is suitable for use with CNC lathe, drilling machines, milling machines, and more, compatible with various machining applications. 5. [Excellent Replacement] Serving as a reliable alternative to old parts, our collet chuck holder provides a dependable solution for upgrading and improving your machining equipment. Specification: Item Type: Collet Chuck Extension Rod Material: Manganese Steel Model: C16 ER16A 150L + ER16A. Package List: 1 x Collet Chuck Extension Rod 1 x Wrench 1 x Storage Box