Features:_x000D__x000D_Made of high grade specially formulated spring steel, durable in use. _x000D_Professional manufacturing, exquisite workmanship, high reliability. _x000D_Built in self-release design and tools will never get stuck in holder. _x000D_Use with any standard ER collet chucks for coolant-thru tool applications. _x000D_Widely used for boring, milling, drilling, silk attack, sculpture, CNC, and other processing. _x000D_ _x000D_Specification:_x000D_Condition: 100% brand new_x000D_Spring Collet Model: ER11-1, ER11-2, ER11-3, ER11-4, ER11-5, ER11-6, ER11-7_x000D__x000D_Package List:_x000D_1 x Extension Rod_x000D_7 x Spring Collet_x000D__x000D__x000D__x000D_Note:_x000D_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. 1Made of high grade specially formulated spring steel, durable in use. 2Professional manufacturing, exquisite workmanship, high reliability. 3Built in self?release design and tools will never get stuck in holder. 4Use with any standard ER collet chucks for coolant?thru tool applications. 5Widely used for boring, milling, drilling, silk attack, sculpture, CNC, and other processing.