Features 1、Made of high grade specially formulated spring steel, durable in use. 2、Professional manufacturing, exquisite workmanship, high reliability. 3、Built in self‑release design and tools will never get stuck in holder. 4、Use with any standard ER collet chucks for coolant‑thru tool applications. 5、Widely used for boring, milling, drilling, silk attack, sculpture, CNC, and other processing. Specification Features: Made of high grade specially formulated spring steel, durable in use. Professional manufacturing, exquisite workmanship, high reliability. Built in self-release design and tools will never get stuck in holder. Use with any standard ER collet chucks for coolant-thru tool applications. Widely used for boring, milling, drilling, silk attack, sculpture, CNC, and other processing. Specification: Condition: 100% brand new Spring Collet Model: ER11-1, ER11-2, ER11-3, ER11-4, ER11-5, ER11-6, ER11-7 Package List: 1 x Extension Rod 7 x Spring Collet Note: 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. Package List