ER11 Extension Rod + 7Pcs 1 7mm Spring Collets 5mm Motor Shaft Holder for CNC Engraving Machine

Extension rod is made of high grade specially formulated spring steel, high strength and hardness, heat treated, wear resistance, surface treated, rust-proof, durable in use. Professional manufacturing, exquisite workmanship, high reliability. Built in self-release design and tools will never get stuck in holder. Power lathe chuck must be assembled into the clamping nut before inserting into the chuck, 7pcs spring collets, easy to change, strong clamping force. Use with any standard ER collet chucks for coolant-thru tool applications, built in self-release design, never get stuck in holder. Extension rod is widely used for boring, milling, drilling, silk attack, sculpture, CNC, and other processing.