Features: *100% brand new and high quality *Made of high grade specially formulated spring steel *Hardened and precision ground *Built in self-Release design and tools will never get stuck in holder Specifications: * Style: ER11 * Material: High Grade 45 Carbon Steel * Color:As Pictures Show * Total Height: Approx. 18mm * Outer Diameter(Max): Approx. 11.5mm * Gripping Range: 4MM