Feature: 1. [Carbon Steel Construction] Made from carbon steel material, this ER40 collet chuck has high strength and hardness, ensuring long lasting performance. 2. [Versatile Usage] This collet chuck can be easily installed onto your selected backing plate for use on a lathe, or utilized as a fixture on a milling machine. 3. [Standard Size] The chuck holder adopts standardized production and can directly replace damaged parts, ensuring seamless continuity in your machining processes. 4. [Enhances Processing] With its steel construction and precise design, this collet chuck facilitates more efficient product processing, improving overall productivity. 5. [100mm Diameter] Featuring a 100mm diameter size, this ER40 collet chuck is suitable for a wide range of applications, making it a versatile tool for precise machining tasks. Specification: Item Type: ER40 Collet Chuck Material: Carbon Steel Model: ER40 D100 Chuck Diameter: Approx. 100mm / 3.94in. Package List: 1 x ER40 Collet Chuck